[racket] boolean in PLAI

From: Shriram Krishnamurthi (sk at cs.brown.edu)
Date: Thu Jan 16 15:30:29 EST 2014

Is this the sort of problem you're talking about?

http://cs.brown.edu/courses/cs173/2012/book/Everything__We_Will_Say__About_Parsing.html#(part._.Types_for_.Parsing)

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