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<PAGE>
Exhibit 23.1
CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
As independent public accountants, we hereby consent to the incorporation of our
reports in this Form 10-K, into the Company's previously filed Registration
Statement File Nos. 333-39269, 333-29991, 333-11695, 333-00885, 333-00413, 33-
64169, 33-62295 and 33-62467.
ARTHUR ANDERSEN LLP
Philadelphia, Pennsylvania
June 29, 2000
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