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<PAGE> EXHIBIT 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS. As independent public accountants, we hereby consent to the use of our reports dated November 15, 2000 included in this Form 8-K into the Company's previously filed Registration Statement File No.'s 33-35191, 33-47830, 33-87792, 33-84795, 333-11853, 333-11849, 333-34003, 333-79167 and 333-34634. /s/ Arthur Andersen LLP Boston, Massachusetts November 24, 2000
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