[plt-scheme] equal? and shared structure

From: Prabhakar Ragde (plragde at uwaterloo.ca)
Date: Tue Dec 18 22:19:01 EST 2007

Under what circumstances will equal? terminate with the right answer 
when given cons-structures with sharing (and possibly cycles)? The two I 
concocted for homework seem not to break it, but others do. Thanks. --PR

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