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[plt-scheme] Problem exporting constructor primitives for HtDP beginner student

From: Noel Welsh (noelwelsh at gmail.com)
Date: Mon May 11 05:01:16 EDT 2009		 
Probably you need to make the structure transparent

  (define-struct book (title author year) #:transparent)

N.

> The field values of the structure are not displayed as expected, and the
> test fails.
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