Question: What chain of discount stores last operated in 1990 and used Mammoth Mart for their prototype?
Sentence (from "Mammoth Mart"): The chain was founded by Max Coffman and Henry Gornstein in Framingham, Massachusetts in 1956, and was something of a prototype for the large, downscale department store, selling housewares, hardware and clothing in stark, unfussy buildings, usually in suburban shopping center locations.
Relevant evidence: No