0001021408-01-502751 11-K 1 20001231 20010628 SEI CORP 0000350894 6211 231707341 PA 1231 11-K 34 000-10200 1669697 1 FREEDOM VALLEY DRIVE OAKS PA 19456-1100 6106761000 1 FREEDOM VALLEY DRIVE OAKS PA 19456-1100 11-K 1 d11k.txt FORM 11-K