[racket] Bootstrap teachpacks

From: Danny Yoo (dyoo at hashcollision.org)
Date: Tue May 14 20:34:45 EDT 2013

Hi Lawrence,


You probably need to also install the support teachpack file
"bootstrap-common.rkt", which can be found here:

    http://www.bootstrapworld.org/materials/resources/source-files/Teachpacks/

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