NUVEEN TAX EXEMPT UNIT TRUST SERIES 556
485BPOS, EX-27.1NATINS193, 2000-09-26
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

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  <ARTICLE> 6
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  <NAME> NUVEEN TAX-FREE UNIT TRUST
  <SERIES> Series  556
  <NAME> NATIONAL INSURED TRUST
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  [AVG-DEBT-OUTSTANDING] 0
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