Question: What chain of discount stores last operated in 1990 and used Mammoth Mart for their prototype?
Sentence (from "Zayre"): In October 1988, Zayre's parent company, Zayre Corp., sold the stores to the competing Ames Department Stores, Inc. chain, and in June 1989, Zayre Corp. merged with one of its subsidiaries, The TJX Companies, parent company of T.J. Maxx.
Relevant evidence: No