MFS MUNICIPAL SERIES TRUST
NSAR-B, 1999-05-27
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<PAGE>      PAGE  1
000 B000000 03/31/99
000 C000000 0000751656
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 MFS MUNICIPAL SERIES TRUST
001 B000000 811-4096
001 C000000 6179545000
002 A000000 500 BOYLSTON STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02116
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000 16
007 C010100  1
007 C020100 MFS MARYLAND MUNICIPAL BOND FUND
007 C030100 N
007 C010200  2
007 C020200 MFS NORTH CAROLINA MUNICIPAL BOND FUND
007 C030200 N
007 C010300  3
007 C020300 MFS SOUTH CAROLINA MUNICIPAL BOND FUND
007 C030300 N
007 C010400  4
007 C020400 MFS VIRGINIA MUNICIPAL BOND FUND
007 C030400 N
007 C010500  5
007 C020500 MFS WEST VIRGINIA MUNICIPAL BOND FUND
007 C030500 N
007 C010600  6
007 C020600 MFS MASSACHUSETTS MUNICIPAL BOND FUND
007 C030600 N
007 C010700  7
007 C020700 MFS GEORGIA MUNICIPAL BOND FUND
007 C030700 N
007 C010800  8
007 C010900  9
007 C011000 10
007 C011100 11
007 C021100 MFS NEW YORK MUNICIPAL BOND FUND
007 C031100 N
007 C011200 12
007 C011300 13
<PAGE>      PAGE  2
007 C021300 MFS TENNESEE MUNICIPAL BOND FUND
007 C031300 N
007 C011400 14
007 C021400 MFS ALABAMA MUNICIPAL BOND FUND
007 C031400 N
007 C011500 15
007 C021500 MFS ARKANSAS MUNICIPAL BOND FUND
007 C031500 N
007 C011600 16
007 C011700 17
007 C021700 MFS FLORIDA MUNICIPAL BOND FUND
007 C031700 N
007 C011800 18
007 C021800 MFS MISSISSIPPI MUNICIPAL BOND FUND
007 C031800 N
007 C011900 19
007 C012000 20
007 C012100 21
007 C022100 MFS PENNSYLVANIA MUNICIPAL BOND FUND
007 C032100 N
007 C012200 22
007 C022200 MFS CALIFORNIA MUNICIPAL BOND FUND
007 C032200 N
007 C012300 23
007 C022300 MFS MUNICIPAL INCOME FUND
007 C032300 N
007 C012400 24
007 C012500 25
007 C012600 26
007 C012700 27
007 C012800 28
007 C012900 29
007 C013000 30
007 C013100 31
007 C013200 32
007 C013300 33
007 C013400 34
007 C013500 35
007 C013600 36
007 C013700 37
007 C013800 38
007 C013900 39
007 C014000 40
008 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
008 B00AA01 A
008 C00AA01 801-17352
008 D01AA01 BOSTON
008 D02AA01 MA
008 D03AA01 02116
010 A00AA01 MASSACHUSETTS FINANCIAL SERVICES
010 B00AA01 801-17352
<PAGE>      PAGE  3
010 C01AA01 BOSTON
010 C02AA01 MA
010 C03AA01 02116
011 A00AA01 MFS FUND DISTRIBUTORS, INC.
011 B00AA01 8-27864
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02116
012 A00AA01 MFS SERVICE CENTER, INC.
012 B00AA01 84-1316
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02116
013 A00AA01 DELOITTE & TOUCHE LLP
013 B01AA01 BOSTON
013 B02AA01 MA
013 B03AA01 02110
015 A00AA01 STATE STREET BANK & TRUST COMPANY
015 B00AA01 C
015 C01AA01 BOSTON
015 C02AA01 MA
015 C03AA01 02110
015 E01AA01 X
015 A00AA02 THE BANK OF NEW YORK
015 B00AA02 S
015 C01AA02 NEW YORK
015 C02AA02 NY
015 C03AA02 10286
015 E01AA02 X
015 A00AA03 CHASE MANHATTAN BANK
015 B00AA03 S
015 C01AA03 NEW YORK
015 C02AA03 NY
015 C03AA03 10041
015 E01AA03 X
015 A00AA04 MORGAN GUARANTY TRUST COMPANY
015 B00AA04 S
015 C01AA04 NEW YORK
015 C02AA04 NY
015 C03AA04 10015
015 E01AA04 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   53
019 C00AA00 MASSFINSER
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020 C000002      0
020 C000003      0
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<PAGE>      PAGE  4
020 C000007      0
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022 C000001    257275
022 D000001    240782
022 A000002 PAINE WEBBER
022 B000002 13-2638166
022 C000002    267175
022 D000002    206684
022 A000003 JP MORGAN
022 B000003 13-3224016
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022 D000003    231818
022 A000004 MERRILL LYNCH
022 B000004 13-5674085
022 C000004    112590
022 D000004    112896
022 A000005 BEAR STEARNS
022 B000005 13-3299429
022 C000005     94152
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022 A000006 PNC SECURITIES
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022 A000007 FIRST ALBANY
022 B000007 00-0000000
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022 A000008 CITIBANK
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022 C000008     56475
022 D000008     57375
022 A000009 INTERSTATE/ JOHNSON LANE
022 B000009 00-0000000
022 C000009     26103
022 D000009     57152
022 A000010 GOLDMAN SACHS & CO.
022 B000010 13-5108880
022 C000010     65505
022 D000010     26103
023 C000000    1619578
023 D000000    1581042
024  00AA00 N
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<PAGE>      PAGE  5
025 D00AA04       0
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<PAGE>      PAGE  6
083 A00AA00 N
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<PAGE>      PAGE  7
031 A000100     63
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<PAGE>      PAGE  8
055 A000100 Y
055 B000100 N
056  000100 Y
057  000100 N
058 A000100 N
059  000100 Y
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070 F020100 N
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070 H020100 N
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070 I020100 N
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070 J020100 N
<PAGE>      PAGE  9
070 K010100 N
070 K020100 N
070 L010100 N
070 L020100 N
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070 Q010100 N
070 Q020100 N
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<PAGE>      PAGE  10
072DD020100      993
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<PAGE>      PAGE  11
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<PAGE>      PAGE  12
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048 I020200 0.000
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050  000200 N
051  000200 N
052  000200 N
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053 C000200 Y
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055 B000200 N
056  000200 Y
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058 A000200 N
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<PAGE>      PAGE  13
064 B000200 N
070 A010200 Y
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070 B020200 N
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
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<PAGE>      PAGE  16
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050  000300 N
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<PAGE>      PAGE  17
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<PAGE>      PAGE  18
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<PAGE>      PAGE  19
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<PAGE>      PAGE  20
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<PAGE>      PAGE  21
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<PAGE>      PAGE  22
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<PAGE>      PAGE  23
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<PAGE>      PAGE  24
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<PAGE>      PAGE  25
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<PAGE>      PAGE  26
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<PAGE>      PAGE  27
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<PAGE>      PAGE  28
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<PAGE>      PAGE  29
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<PAGE>      PAGE  30
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<PAGE>      PAGE  31
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<PAGE>      PAGE  32
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<PAGE>      PAGE  33
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<PAGE>      PAGE  34
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<PAGE>      PAGE  36
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<PAGE>      PAGE  37
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028 F031100         0
028 F041100       938
028 G011100     13822
028 G021100      1998
028 G031100         0
028 G041100     13249
028 H001100      9839
029  001100 Y
030 A001100    154
030 B001100  4.75
030 C001100  0.00
031 A001100     18
031 B001100      0
032  001100    136
033  001100      0
034  001100 Y
<PAGE>      PAGE  38
035  001100     48
036 A001100 N
036 B001100      0
042 A001100   0
042 B001100   0
042 C001100  37
042 D001100  63
042 E001100   0
042 F001100   0
042 G001100   0
042 H001100   0
043  001100    579
044  001100      0
045  001100 Y
046  001100 N
047  001100 Y
048  001100  0.550
048 A011100        0
048 A021100 0.000
048 B011100        0
048 B021100 0.000
048 C011100        0
048 C021100 0.000
048 D011100        0
048 D021100 0.000
048 E011100        0
048 E021100 0.000
048 F011100        0
048 F021100 0.000
048 G011100        0
048 G021100 0.000
048 H011100        0
048 H021100 0.000
048 I011100        0
048 I021100 0.000
048 J011100        0
048 J021100 0.000
048 K011100        0
048 K021100 0.000
049  001100 N
050  001100 N
051  001100 N
052  001100 N
053 A001100 Y
053 B001100 Y
053 C001100 Y
055 A001100 Y
055 B001100 Y
056  001100 Y
057  001100 N
058 A001100 N
<PAGE>      PAGE  39
059  001100 Y
060 A001100 N
060 B001100 N
061  001100     1000
062 A001100 Y
062 B001100   0.0
062 C001100   0.0
062 D001100   0.0
062 E001100   1.7
062 F001100   0.0
062 G001100   0.0
062 H001100   0.0
062 I001100   0.0
062 J001100   0.0
062 K001100   0.0
062 L001100   0.0
062 M001100   0.0
062 N001100   0.0
062 O001100  96.8
062 P001100   0.0
062 Q001100   0.0
062 R001100   0.0
063 A001100   0
063 B001100 14.4
064 A001100 Y
064 B001100 Y
065  001100 N
070 A011100 Y
070 A021100 N
070 B011100 N
070 B021100 N
070 C011100 Y
070 C021100 N
070 D011100 N
070 D021100 N
070 E011100 Y
070 E021100 Y
070 F011100 N
070 F021100 N
070 G011100 Y
070 G021100 N
070 H011100 N
070 H021100 N
070 I011100 N
070 I021100 N
070 J011100 Y
070 J021100 Y
070 K011100 N
070 K021100 N
070 L011100 N
070 L021100 N
<PAGE>      PAGE  40
070 M011100 N
070 M021100 N
070 N011100 N
070 N021100 N
070 O011100 Y
070 O021100 N
070 P011100 Y
070 P021100 N
070 Q011100 N
070 Q021100 N
070 R011100 N
070 R021100 N
071 A001100     37852
071 B001100     38706
071 C001100    143025
071 D001100   26
072 A001100 12
072 B001100     8463
072 C001100        0
072 D001100        0
072 E001100        0
072 F001100      794
072 G001100       18
072 H001100        0
072 I001100      162
072 J001100       52
072 K001100        8
072 L001100       13
072 M001100       18
072 N001100        0
072 O001100        0
072 P001100        0
072 Q001100        0
072 R001100       33
072 S001100        1
072 T001100      576
072 U001100        0
072 V001100        0
072 W001100       58
072 X001100     1733
072 Y001100      203
072 Z001100     6933
072AA001100     2321
072BB001100        0
072CC011100        0
072CC021100     2187
072DD011100     5738
072DD021100     1209
072EE001100        0
073 A011100   0.5600
073 A021100   0.4700
<PAGE>      PAGE  41
073 B001100   0.0000
073 C001100   0.0000
074 A001100       83
074 B001100        0
074 C001100     2500
074 D001100   142481
074 E001100        0
074 F001100        0
074 G001100        0
074 H001100        0
074 I001100        0
074 J001100       35
074 K001100        0
074 L001100     2456
074 M001100        2
074 N001100   147557
074 O001100        0
074 P001100        4
074 Q001100        0
074 R011100        0
074 R021100        0
074 R031100        0
074 R041100      379
074 S001100        0
074 T001100   147174
074 U011100    10361
074 U021100     2699
074 V011100    11.27
074 V021100    11.27
074 W001100   0.0000
074 X001100     3299
074 Y001100        0
075 A001100        0
075 B001100   145108
076  001100     0.00
028 A011300      1129
028 A021300       240
028 A031300         0
028 A041300      1062
028 B011300       702
028 B021300       240
028 B031300         0
028 B041300      1307
028 C011300      1197
028 C021300       484
028 C031300         0
028 C041300       586
028 D011300       790
028 D021300       238
028 D031300         0
028 D041300       619
<PAGE>      PAGE  42
028 E011300      5134
028 E021300       248
028 E031300         0
028 E041300       777
028 F011300      7859
028 F021300       273
028 F031300         0
028 F041300       728
028 G011300     16811
028 G021300      1723
028 G031300         0
028 G041300      5080
028 H001300     12978
029  001300 Y
030 A001300    159
030 B001300  4.75
030 C001300  0.00
031 A001300     29
031 B001300      0
032  001300    130
033  001300      0
034  001300 Y
035  001300     55
036 A001300 N
036 B001300      0
042 A001300   0
042 B001300   0
042 C001300  45
042 D001300  55
042 E001300   0
042 F001300   0
042 G001300   0
042 H001300   0
043  001300    579
044  001300      0
045  001300 Y
046  001300 N
047  001300 Y
048  001300  0.550
048 A011300        0
048 A021300 0.000
048 B011300        0
048 B021300 0.000
048 C011300        0
048 C021300 0.000
048 D011300        0
048 D021300 0.000
048 E011300        0
048 E021300 0.000
048 F011300        0
048 F021300 0.000
<PAGE>      PAGE  43
048 G011300        0
048 G021300 0.000
048 H011300        0
048 H021300 0.000
048 I011300        0
048 I021300 0.000
048 J011300        0
048 J021300 0.000
048 K011300        0
048 K021300 0.000
049  001300 N
050  001300 N
051  001300 N
052  001300 N
053 A001300 Y
053 B001300 Y
053 C001300 Y
055 A001300 Y
055 B001300 N
056  001300 Y
057  001300 N
058 A001300 N
059  001300 Y
060 A001300 N
060 B001300 N
061  001300     1000
062 A001300 Y
062 B001300   0.0
062 C001300   0.0
062 D001300   0.0
062 E001300   3.3
062 F001300   0.0
062 G001300   0.0
062 H001300   0.0
062 I001300   0.0
062 J001300   0.0
062 K001300   0.0
062 L001300   0.0
062 M001300   0.0
062 N001300   0.0
062 O001300  96.7
062 P001300   0.0
062 Q001300   0.0
062 R001300   0.0
063 A001300   0
063 B001300 15.6
064 A001300 Y
064 B001300 N
070 A011300 Y
070 A021300 N
070 B011300 N
<PAGE>      PAGE  44
070 B021300 N
070 C011300 Y
070 C021300 N
070 D011300 N
070 D021300 N
070 E011300 Y
070 E021300 Y
070 F011300 N
070 F021300 N
070 G011300 Y
070 G021300 N
070 H011300 N
070 H021300 N
070 I011300 N
070 I021300 N
070 J011300 Y
070 J021300 Y
070 K011300 N
070 K021300 N
070 L011300 N
070 L021300 N
070 M011300 N
070 M021300 N
070 N011300 N
070 N021300 N
070 O011300 Y
070 O021300 Y
070 P011300 Y
070 P021300 N
070 Q011300 N
070 Q021300 N
070 R011300 N
070 R021300 N
071 A001300     28536
071 B001300     19956
071 C001300    125588
071 D001300   16
072 A001300 12
072 B001300     7438
072 C001300        0
072 D001300        0
072 E001300        0
072 F001300      702
072 G001300       16
072 H001300        0
072 I001300      143
072 J001300       45
072 K001300        5
072 L001300        9
072 M001300       19
072 N001300        0
<PAGE>      PAGE  45
072 O001300        0
072 P001300        0
072 Q001300        0
072 R001300       32
072 S001300        3
072 T001300      576
072 U001300        0
072 V001300        0
072 W001300       52
072 X001300     1602
072 Y001300      178
072 Z001300     6014
072AA001300     1052
072BB001300        0
072CC011300        0
072CC021300     1234
072DD011300     5138
072DD021300      822
072EE001300      403
073 A011300   0.5200
073 A021300   0.4500
073 B001300   0.0300
073 C001300   0.0000
074 A001300       43
074 B001300        0
074 C001300     4600
074 D001300   135399
074 E001300        0
074 F001300        0
074 G001300        0
074 H001300        0
074 I001300        0
074 J001300        0
074 K001300        0
074 L001300     2005
074 M001300        1
074 N001300   142048
074 O001300     1617
074 P001300        4
074 Q001300        0
074 R011300        0
074 R021300        0
074 R031300        0
074 R041300      366
074 S001300        0
074 T001300   140061
074 U011300    10789
074 U021300     2095
074 V011300    10.87
074 V021300    10.86
074 W001300   0.0000
<PAGE>      PAGE  46
074 X001300     2273
074 Y001300        0
075 A001300        0
075 B001300   128216
076  001300     0.00
028 A011400       387
028 A021400       140
028 A031400         0
028 A041400       498
028 B011400       245
028 B021400       140
028 B031400         0
028 B041400       279
028 C011400      1165
028 C021400       266
028 C031400         0
028 C041400       594
028 D011400       744
028 D021400       140
028 D031400         0
028 D041400       562
028 E011400       762
028 E021400       140
028 E031400         0
028 E041400       631
028 F011400       857
028 F021400       139
028 F031400         0
028 F041400       626
028 G011400      4161
028 G021400       966
028 G031400         0
028 G041400      3190
028 H001400      2337
029  001400 Y
030 A001400    109
030 B001400  4.75
030 C001400  0.00
031 A001400     20
031 B001400      0
032  001400     89
033  001400      0
034  001400 Y
035  001400      6
036 A001400 N
036 B001400      0
042 A001400   0
042 B001400   0
042 C001400  25
042 D001400  75
042 E001400   0
<PAGE>      PAGE  47
042 F001400   0
042 G001400   0
042 H001400   0
043  001400    281
044  001400      0
045  001400 Y
046  001400 N
047  001400 Y
048  001400  0.550
048 A011400        0
048 A021400 0.000
048 B011400        0
048 B021400 0.000
048 C011400        0
048 C021400 0.000
048 D011400        0
048 D021400 0.000
048 E011400        0
048 E021400 0.000
048 F011400        0
048 F021400 0.000
048 G011400        0
048 G021400 0.000
048 H011400        0
048 H021400 0.000
048 I011400        0
048 I021400 0.000
048 J011400        0
048 J021400 0.000
048 K011400        0
048 K021400 0.000
049  001400 N
050  001400 N
051  001400 N
052  001400 N
053 A001400 Y
053 B001400 Y
053 C001400 Y
055 A001400 N
055 B001400 N
056  001400 Y
057  001400 N
058 A001400 N
059  001400 Y
060 A001400 N
060 B001400 N
061  001400     1000
062 A001400 Y
062 B001400   0.0
062 C001400   0.0
062 D001400   0.0
<PAGE>      PAGE  48
062 E001400   1.5
062 F001400   0.0
062 G001400   0.0
062 H001400   0.0
062 I001400   0.0
062 J001400   0.0
062 K001400   0.0
062 L001400   0.0
062 M001400   0.0
062 N001400   0.0
062 O001400  99.8
062 P001400   0.0
062 Q001400   0.0
062 R001400   0.0
063 A001400   0
063 B001400 17.1
064 A001400 Y
064 B001400 N
070 A011400 Y
070 A021400 N
070 B011400 N
070 B021400 N
070 C011400 Y
070 C021400 N
070 D011400 N
070 D021400 N
070 E011400 Y
070 E021400 Y
070 F011400 N
070 F021400 N
070 G011400 Y
070 G021400 N
070 H011400 N
070 H021400 N
070 I011400 N
070 I021400 N
070 J011400 Y
070 J021400 Y
070 K011400 N
070 K021400 N
070 L011400 N
070 L021400 N
070 M011400 N
070 M021400 N
070 N011400 N
070 N021400 N
070 O011400 Y
070 O021400 N
070 P011400 Y
070 P021400 N
070 Q011400 N
<PAGE>      PAGE  49
070 Q021400 N
070 R011400 N
070 R021400 N
071 A001400     21472
071 B001400     19344
071 C001400     83443
071 D001400   23
072 A001400 12
072 B001400     5009
072 C001400        0
072 D001400        0
072 E001400        0
072 F001400      459
072 G001400       10
072 H001400        0
072 I001400       94
072 J001400       30
072 K001400        3
072 L001400        7
072 M001400       21
072 N001400        0
072 O001400        0
072 P001400        0
072 Q001400        0
072 R001400       31
072 S001400        1
072 T001400      280
072 U001400        0
072 V001400        0
072 W001400       31
072 X001400      967
072 Y001400      117
072 Z001400     4159
072AA001400     1016
072BB001400        0
072CC011400        0
072CC021400     1147
072DD011400     3932
072DD021400      434
072EE001400        0
073 A011400   0.5400
073 A021400   0.4600
073 B001400   0.0300
073 C001400   0.0000
074 A001400       99
074 B001400        0
074 C001400     1300
074 D001400    85098
074 E001400        0
074 F001400        0
074 G001400        0
<PAGE>      PAGE  50
074 H001400        0
074 I001400        0
074 J001400     1323
074 K001400        0
074 L001400     1468
074 M001400        0
074 N001400    89288
074 O001400     3677
074 P001400        2
074 Q001400        0
074 R011400        0
074 R021400        0
074 R031400        0
074 R041400      306
074 S001400        0
074 T001400    85303
074 U011400     6864
074 U021400     1064
074 V011400    10.76
074 V021400    10.76
074 W001400   0.0000
074 X001400     1332
074 Y001400        0
075 A001400        0
075 B001400    83912
076  001400     0.00
028 A011500      1169
028 A021500       241
028 A031500         0
028 A041500      1035
028 B011500       503
028 B021500       242
028 B031500         0
028 B041500       754
028 C011500       643
028 C021500       238
028 C031500         0
028 C041500      1290
028 D011500       684
028 D021500       236
028 D031500         0
028 D041500      1485
028 E011500       528
028 E021500       234
028 E031500         0
028 E041500      2277
028 F011500       524
028 F021500       233
028 F031500         0
028 F041500      1266
028 G011500      4051
<PAGE>      PAGE  51
028 G021500      1425
028 G031500         0
028 G041500      8106
028 H001500      2372
029  001500 Y
030 A001500    198
030 B001500  4.75
030 C001500  0.00
031 A001500     36
031 B001500      0
032  001500    162
033  001500      0
034  001500 Y
035  001500     22
036 A001500 N
036 B001500      0
042 A001500   0
042 B001500   0
042 C001500  32
042 D001500  68
042 E001500   0
042 F001500   0
042 G001500   0
042 H001500   0
043  001500    205
044  001500      0
045  001500 Y
046  001500 N
047  001500 Y
048  001500  0.550
048 A011500        0
048 A021500 0.000
048 B011500        0
048 B021500 0.000
048 C011500        0
048 C021500 0.000
048 D011500        0
048 D021500 0.000
048 E011500        0
048 E021500 0.000
048 F011500        0
048 F021500 0.000
048 G011500        0
048 G021500 0.000
048 H011500        0
048 H021500 0.000
048 I011500        0
048 I021500 0.000
048 J011500        0
048 J021500 0.000
048 K011500        0
<PAGE>      PAGE  52
048 K021500 0.000
049  001500 N
050  001500 N
051  001500 N
052  001500 N
053 A001500 Y
053 B001500 Y
053 C001500 Y
055 A001500 N
055 B001500 N
056  001500 Y
057  001500 N
058 A001500 N
059  001500 Y
060 A001500 N
060 B001500 N
061  001500     1000
062 A001500 Y
062 B001500   0.0
062 C001500   0.0
062 D001500   0.0
062 E001500   0.6
062 F001500   0.0
062 G001500   0.0
062 H001500   0.0
062 I001500   0.0
062 J001500   0.0
062 K001500   0.0
062 L001500   0.0
062 M001500   0.0
062 N001500   0.0
062 O001500  98.4
062 P001500   0.0
062 Q001500   0.0
062 R001500   0.0
063 A001500   0
063 B001500 16.4
064 A001500 Y
064 B001500 N
070 A011500 Y
070 A021500 N
070 B011500 N
070 B021500 N
070 C011500 Y
070 C021500 N
070 D011500 N
070 D021500 N
070 E011500 Y
070 E021500 Y
070 F011500 N
070 F021500 N
<PAGE>      PAGE  53
070 G011500 Y
070 G021500 N
070 H011500 N
070 H021500 N
070 I011500 N
070 I021500 N
070 J011500 Y
070 J021500 N
070 K011500 N
070 K021500 N
070 L011500 N
070 L021500 N
070 M011500 N
070 M021500 N
070 N011500 N
070 N021500 N
070 O011500 Y
070 O021500 N
070 P011500 Y
070 P021500 N
070 Q011500 N
070 Q021500 N
070 R011500 N
070 R021500 N
071 A001500     16541
071 B001500     21387
071 C001500    134854
071 D001500   12
072 A001500 12
072 B001500     7813
072 C001500        0
072 D001500        0
072 E001500        0
072 F001500      753
072 G001500       17
072 H001500        0
072 I001500      154
072 J001500       48
072 K001500        8
072 L001500       11
072 M001500       18
072 N001500        0
072 O001500        0
072 P001500        0
072 Q001500        0
072 R001500       31
072 S001500        2
072 T001500      195
072 U001500        2
072 V001500        0
072 W001500       49
<PAGE>      PAGE  54
072 X001500     1286
072 Y001500      188
072 Z001500     6715
072AA001500      590
072BB001500        0
072CC011500        0
072CC021500     1184
072DD011500     6318
072DD021500      371
072EE001500        0
073 A011500   0.5000
073 A021500   0.4300
073 B001500   0.0000
073 C001500   0.0000
074 A001500       25
074 B001500        0
074 C001500      800
074 D001500   133147
074 E001500        0
074 F001500        0
074 G001500        0
074 H001500        0
074 I001500        0
074 J001500       19
074 K001500        0
074 L001500     1934
074 M001500        2
074 N001500   135927
074 O001500        0
074 P001500        2
074 Q001500        0
074 R011500        0
074 R021500        0
074 R031500        0
074 R041500      672
074 S001500        0
074 T001500   135253
074 U011500    12291
074 U021500     1046
074 V011500    10.14
074 V021500    10.14
074 W001500   0.0000
074 X001500     2744
074 Y001500        0
075 A001500        0
075 B001500   137626
076  001500     0.00
048  001600  0.000
048 A011600        0
048 A021600 0.000
048 B011600        0
<PAGE>      PAGE  55
048 B021600 0.000
048 C011600        0
048 C021600 0.000
048 D011600        0
048 D021600 0.000
048 E011600        0
048 E021600 0.000
048 F011600        0
048 F021600 0.000
048 G011600        0
048 G021600 0.000
048 H011600        0
048 H021600 0.000
048 I011600        0
048 I021600 0.000
048 J011600        0
048 J021600 0.000
048 K011600        0
048 K021600 0.000
028 A011700      1470
028 A021700       143
028 A031700         0
028 A041700       609
028 B011700      2898
028 B021700       142
028 B031700         0
028 B041700       866
028 C011700     12376
028 C021700       149
028 C031700         0
028 C041700      2047
028 D011700      1568
028 D021700       148
028 D031700         0
028 D041700      9920
028 E011700       955
028 E021700       149
028 E031700         0
028 E041700      1240
028 F011700      1339
028 F021700       151
028 F031700         0
028 F041700      1068
028 G011700     20605
028 G021700       883
028 G031700         0
028 G041700     15751
028 H001700     16151
029  001700 Y
030 A001700    203
030 B001700  4.75
<PAGE>      PAGE  56
030 C001700  0.00
031 A001700     38
031 B001700      0
032  001700    165
033  001700      0
034  001700 Y
035  001700     57
036 A001700 N
036 B001700      0
042 A001700   0
042 B001700   0
042 C001700  94
042 D001700   6
042 E001700   0
042 F001700   0
042 G001700   0
042 H001700   0
043  001700    147
044  001700      0
045  001700 Y
046  001700 N
047  001700 Y
048  001700  0.550
048 A011700        0
048 A021700 0.000
048 B011700        0
048 B021700 0.000
048 C011700        0
048 C021700 0.000
048 D011700        0
048 D021700 0.000
048 E011700        0
048 E021700 0.000
048 F011700        0
048 F021700 0.000
048 G011700        0
048 G021700 0.000
048 H011700        0
048 H021700 0.000
048 I011700        0
048 I021700 0.000
048 J011700        0
048 J021700 0.000
048 K011700        0
048 K021700 0.000
049  001700 N
050  001700 N
051  001700 N
052  001700 N
053 A001700 Y
053 B001700 Y
<PAGE>      PAGE  57
053 C001700 Y
055 A001700 Y
055 B001700 N
056  001700 Y
057  001700 N
058 A001700 N
059  001700 Y
060 A001700 N
060 B001700 N
061  001700     1000
062 A001700 Y
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062 D001700   0.0
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062 F001700   0.0
062 G001700   0.0
062 H001700   0.0
062 I001700   0.0
062 J001700   0.0
062 K001700   0.0
062 L001700   0.0
062 M001700   0.0
062 N001700   0.0
062 O001700  96.5
062 P001700   0.0
062 Q001700   0.0
062 R001700   0.0
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063 B001700 14.9
064 A001700 Y
064 B001700 N
070 A011700 Y
070 A021700 N
070 B011700 N
070 B021700 N
070 C011700 Y
070 C021700 N
070 D011700 N
070 D021700 N
070 E011700 Y
070 E021700 Y
070 F011700 N
070 F021700 N
070 G011700 Y
070 G021700 N
070 H011700 N
070 H021700 N
070 I011700 N
070 I021700 N
070 J011700 Y
<PAGE>      PAGE  58
070 J021700 N
070 K011700 N
070 K021700 N
070 L011700 N
070 L021700 N
070 M011700 N
070 M021700 N
070 N011700 N
070 N021700 N
070 O011700 Y
070 O021700 N
070 P011700 Y
070 P021700 N
070 Q011700 N
070 Q021700 N
070 R011700 N
070 R021700 N
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072 Q001700        0
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072 S001700        0
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072 Y001700      133
072 Z001700     4588
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<PAGE>      PAGE  59
072DD011700     3800
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074 G001700        0
074 H001700        0
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074 N001700    98850
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074 Q001700        0
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074 R031700        0
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074 T001700    98440
074 U011700     7674
074 U021700     2058
074 V011700    10.12
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074 W001700   0.0000
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028 C021800       138
028 C031800         0
<PAGE>      PAGE  60
028 C041800       605
028 D011800      1167
028 D021800       136
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028 E031800         0
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028 F041800       402
028 G011800      4235
028 G021800       819
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028 G041800      2568
028 H001800      1401
029  001800 Y
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031 B001800      0
032  001800    135
033  001800      0
034  001800 Y
035  001800     16
036 A001800 N
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042 D001800   4
042 E001800   0
042 F001800   0
042 G001800   0
042 H001800   0
043  001800     84
044  001800      0
045  001800 Y
046  001800 N
047  001800 Y
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048 A021800 0.000
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048 B021800 0.000
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<PAGE>      PAGE  61
048 D021800 0.000
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048 E021800 0.000
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048 F021800 0.000
048 G011800        0
048 G021800 0.000
048 H011800        0
048 H021800 0.000
048 I011800        0
048 I021800 0.000
048 J011800        0
048 J021800 0.000
048 K011800        0
048 K021800 0.000
049  001800 N
050  001800 N
051  001800 N
052  001800 N
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053 C001800 Y
055 A001800 N
055 B001800 N
056  001800 Y
057  001800 N
058 A001800 N
059  001800 Y
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062 A001800 Y
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062 G001800   0.0
062 H001800   0.0
062 I001800   0.0
062 J001800   0.0
062 K001800   0.0
062 L001800   0.0
062 M001800   0.0
062 N001800   0.0
062 O001800  97.7
062 P001800   0.0
062 Q001800   0.0
062 R001800   0.0
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063 B001800 16.3
<PAGE>      PAGE  62
064 A001800 Y
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070 A011800 Y
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070 B011800 N
070 B021800 N
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070 C021800 N
070 D011800 N
070 D021800 N
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070 E021800 Y
070 F011800 N
070 F021800 N
070 G011800 Y
070 G021800 N
070 H011800 N
070 H021800 N
070 I011800 N
070 I021800 N
070 J011800 Y
070 J021800 Y
070 K011800 N
070 K021800 N
070 L011800 N
070 L021800 N
070 M011800 N
070 M021800 N
070 N011800 N
070 N021800 N
070 O011800 Y
070 O021800 N
070 P011800 Y
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070 Q011800 N
070 Q021800 N
070 R011800 N
070 R021800 N
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<PAGE>      PAGE  63
072 J001800       29
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073 A011800   0.5000
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074 D001800    76582
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074 P001800        2
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074 R031800        0
074 R041800      316
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074 T001800    78334
<PAGE>      PAGE  64
074 U011800     6732
074 U021800     1153
074 V011800     9.93
074 V021800     9.94
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075 A001800        0
075 B001800    76925
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028 C022100        89
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028 D012100      1044
028 D022100        90
028 D032100         0
028 D042100       509
028 E012100       911
028 E022100        96
028 E032100         0
028 E042100       333
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028 F032100         0
028 F042100       446
028 G012100      6090
028 G022100       543
028 G032100         0
028 G042100      2041
028 H002100      2877
029  002100 Y
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030 B002100  4.75
030 C002100  0.00
031 A002100     22
031 B002100      0
032  002100    101
033  002100      0
034  002100 Y
035  002100     20
036 A002100 N
036 B002100      0
<PAGE>      PAGE  65
042 A002100   0
042 B002100   0
042 C002100  96
042 D002100   4
042 E002100   0
042 F002100   0
042 G002100   0
042 H002100   0
043  002100    171
044  002100      0
045  002100 Y
046  002100 N
047  002100 Y
048  002100  0.550
048 A012100        0
048 A022100 0.000
048 B012100        0
048 B022100 0.000
048 C012100        0
048 C022100 0.000
048 D012100        0
048 D022100 0.000
048 E012100        0
048 E022100 0.000
048 F012100        0
048 F022100 0.000
048 G012100        0
048 G022100 0.000
048 H012100        0
048 H022100 0.000
048 I012100        0
048 I022100 0.000
048 J012100        0
048 J022100 0.000
048 K012100        0
048 K022100 0.000
049  002100 N
050  002100 N
051  002100 N
052  002100 N
053 A002100 Y
053 B002100 Y
053 C002100 Y
055 A002100 N
055 B002100 N
056  002100 Y
057  002100 N
058 A002100 N
059  002100 Y
060 A002100 N
060 B002100 N
<PAGE>      PAGE  66
061  002100     1000
062 A002100 Y
062 B002100   0.0
062 C002100   0.0
062 D002100   0.0
062 E002100   4.6
062 F002100   0.0
062 G002100   0.0
062 H002100   0.0
062 I002100   0.0
062 J002100   0.0
062 K002100   0.0
062 L002100   0.0
062 M002100   0.0
062 N002100   0.0
062 O002100  96.2
062 P002100   0.0
062 Q002100   0.0
062 R002100   0.0
063 A002100   0
063 B002100 14.0
064 A002100 Y
064 B002100 N
070 A012100 Y
070 A022100 N
070 B012100 N
070 B022100 N
070 C012100 Y
070 C022100 N
070 D012100 N
070 D022100 N
070 E012100 Y
070 E022100 Y
070 F012100 N
070 F022100 N
070 G012100 Y
070 G022100 N
070 H012100 N
070 H022100 N
070 I012100 N
070 I022100 N
070 J012100 Y
070 J022100 Y
070 K012100 N
070 K022100 N
070 L012100 N
070 L022100 N
070 M012100 N
070 M022100 N
070 N012100 N
070 N022100 N
<PAGE>      PAGE  67
070 O012100 Y
070 O022100 N
070 P012100 Y
070 P022100 N
070 Q012100 N
070 Q022100 N
070 R012100 N
070 R022100 N
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072 A002100 12
072 B002100     2202
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072 K002100        3
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072 M002100       18
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072 S002100        3
072 T002100      170
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072 X002100      555
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072 Z002100     1854
072AA002100      190
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072DD012100      969
072DD022100      896
072EE002100        0
073 A012100   0.4800
073 A022100   0.4100
073 B002100   0.0000
073 C002100   0.0000
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074 B002100        0
<PAGE>      PAGE  68
074 C002100     2100
074 D002100    43926
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074 F002100        0
074 G002100        0
074 H002100        0
074 I002100        0
074 J002100       30
074 K002100        0
074 L002100      667
074 M002100        2
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074 O002100     1026
074 P002100        3
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074 R012100        0
074 R022100        0
074 R032100        0
074 R042100       79
074 S002100        0
074 T002100    45678
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074 U022100     2417
074 V012100     9.90
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075 A002100        0
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028 D032200         0
028 D042200      4235
028 E012200      6921
028 E022200       497
028 E032200         0
028 E042200      2729
<PAGE>      PAGE  69
028 F012200      7292
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028 F042200      2627
028 G012200     50180
028 G022200      2980
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032  002200    543
033  002200      0
034  002200 Y
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036 A002200 N
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042 D002200  14
042 E002200   0
042 F002200   0
042 G002200   0
042 H002200   0
043  002200    444
044  002200      0
045  002200 Y
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047  002200 Y
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048 B022200 0.000
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048 E022200 0.000
048 F012200        0
048 F022200 0.000
048 G012200        0
048 G022200 0.000
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048 H022200 0.000
<PAGE>      PAGE  70
048 I012200        0
048 I022200 0.000
048 J012200        0
048 J022200 0.000
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048 K022200 0.000
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050  002200 N
051  002200 N
052  002200 N
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053 C002200 Y
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055 B002200 N
056  002200 Y
057  002200 N
058 A002200 N
059  002200 Y
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062 H002200   0.0
062 I002200   0.0
062 J002200   0.0
062 K002200   0.0
062 L002200   0.0
062 M002200   0.0
062 N002200   0.0
062 O002200  96.9
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062 Q002200   0.0
062 R002200   0.0
063 A002200   0
063 B002200 13.6
064 A002200 Y
064 B002200 N
070 A012200 Y
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070 B012200 N
070 B022200 N
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070 C022200 N
070 D012200 N
<PAGE>      PAGE  71
070 D022200 N
070 E012200 Y
070 E022200 Y
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070 F022200 N
070 G012200 Y
070 G022200 N
070 H012200 N
070 H022200 N
070 I012200 N
070 I022200 N
070 J012200 Y
070 J022200 N
070 K012200 N
070 K022200 N
070 L012200 N
070 L022200 N
070 M012200 N
070 M022200 N
070 N012200 N
070 N022200 N
070 O012200 Y
070 O022200 N
070 P012200 Y
070 P022200 N
070 Q012200 N
070 Q022200 N
070 R012200 N
070 R022200 N
071 A002200     93294
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072 L002200       21
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<PAGE>      PAGE  72
072 S002200        5
072 T002200      510
072 U002200        0
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074 B002200        0
074 C002200     9000
074 D002200   289218
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<PAGE>      PAGE  73
076  002200     0.00
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033  002300      0
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042 E002300   0
042 F002300   0
042 G002300   0
042 H002300   0
043  002300   2325
<PAGE>      PAGE  74
044  002300      0
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048 F022300 0.000
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048 G022300 0.000
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048 H022300 0.000
048 I012300        0
048 I022300 0.000
048 J012300        0
048 J022300 0.000
048 K012300        0
048 K022300 0.000
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051  002300 N
052  002300 N
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055 B002300 N
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057  002300 N
058 A002300 N
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062 C002300   0.0
062 D002300   0.0
062 E002300   0.9
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062 G002300   0.0
062 H002300   0.0
<PAGE>      PAGE  75
062 I002300   0.0
062 J002300   0.0
062 K002300   0.0
062 L002300   0.0
062 M002300   0.0
062 N002300   0.0
062 O002300  98.5
062 P002300   0.0
062 Q002300   0.0
062 R002300   0.0
063 A002300   0
063 B002300 17.2
064 A002300 Y
064 B002300 N
070 A012300 Y
070 A022300 N
070 B012300 N
070 B022300 N
070 C012300 Y
070 C022300 N
070 D012300 N
070 D022300 N
070 E012300 Y
070 E022300 Y
070 F012300 N
070 F022300 N
070 G012300 Y
070 G022300 N
070 H012300 N
070 H022300 N
070 I012300 N
070 I022300 N
070 J012300 Y
070 J022300 Y
070 K012300 N
070 K022300 N
070 L012300 N
070 L022300 N
070 M012300 N
070 M022300 N
070 N012300 N
070 N022300 N
070 O012300 Y
070 O022300 N
070 P012300 Y
070 P022300 N
070 Q012300 N
070 Q022300 N
070 R012300 N
070 R022300 N
071 A002300    118065
<PAGE>      PAGE  76
071 B002300    118668
071 C002300    382393
071 D002300   31
072 A002300 12
072 B002300    24393
072 C002300        0
072 D002300        0
072 E002300        0
072 F002300     2702
072 G002300       48
072 H002300        0
072 I002300      426
072 J002300      133
072 K002300       41
072 L002300       57
072 M002300       40
072 N002300        0
072 O002300        0
072 P002300        0
072 Q002300        0
072 R002300       35
072 S002300        5
072 T002300     2311
072 U002300        0
072 V002300        0
072 W002300      179
072 X002300     5977
072 Y002300      575
072 Z002300    18991
072AA002300    11934
072BB002300        0
072CC012300        0
072CC022300    13129
072DD012300    10453
072DD022300     7052
072EE002300        0
073 A012300   0.4700
073 A022300   0.4100
073 B002300   0.0000
073 C002300   0.0000
074 A002300        0
074 B002300        0
074 C002300     3300
074 D002300   383088
074 E002300        0
074 F002300        0
074 G002300        0
074 H002300        0
074 I002300        0
074 J002300     3790
074 K002300        0
<PAGE>      PAGE  77
074 L002300     7617
074 M002300        5
074 N002300   397800
074 O002300     3236
074 P002300       10
074 Q002300        0
074 R012300        0
074 R022300        0
074 R032300        0
074 R042300     5661
074 S002300        0
074 T002300   388893
074 U012300    24068
074 U022300    15689
074 V012300     8.97
074 V022300     8.98
074 W002300   0.0000
074 X002300    10439
074 Y002300        0
075 A002300        0
075 B002300   381081
076  002300     0.00
SIGNATURE   ELLEN MOYNIHAN
TITLE       ASSISTANT TREASURER


WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

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<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

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<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

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<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

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<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

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<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

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<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

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<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

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<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

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<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

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<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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   <NAME> MFS MASSACHUSETTS MUNICIPAL BOND FUND CLASS B
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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   <NAME> MFS MARYLAND MUNICIPAL BOND FUND CLASS B
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
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   <NAME> MFS MISSISSIPPI MUNICIPAL BOND FUND CLASS A
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
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   <NAME> MFS MISSISSIPPI MUNICIPAL BOND FUND CLASS B
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
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   <NAME> MFS NORTH CAROLINA MUNICIPAL BOND FUND CLASS A
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

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<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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   <NAME> MFS NORTH CAROLINA MUNICIPAL BOND FUND CLASS B
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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   <NAME> MFS NEW YORK MUNICIPAL BOND FUND CLASS B
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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   <NAME> MFS PENNSYLVANIA MUNICIPAL BOND FUND CLASS A
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<S>                             <C>
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
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   <NAME> MFS PENNSYLVANIA MUNICIPAL BOND FUND CLASS B
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
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   <NAME> MFS SOUTH CAROLINA MUNICIPAL BOND FUND CLASS A
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

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<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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   <NAME> MFS SOUTH CAROLINA MUNICIPAL BOND FUND CLASS B
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
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<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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   <NAME> MFS TENNESSEE MUNICIPAL BOND FUND CLASS B
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
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