001957208 TO Y 1-I EXCHANGE LIBERTY MEDIA CORP WFROM MANDATORY EXCHANGE 1-I LMCA EXCHANGE EXCHANGE AT&T CORP LIBERTY MEDIA GROUP TO NO Y EX FiA 1-I LIBERTY MEDIA CORP FROMM. Y EXC 001957208 0,1CA 08/14/01 SOLD METROMEDIA FIBER NETWORK INC MFNX CL A EXECUTION BY REDI COMMISSION 27