[plt-scheme] HtDP assf function missing

From: Gadfly (dyrueta at gmail.com)
Date: Tue Feb 16 19:12:06 EST 2010

FYI --

The assf function, which HtDP section 43.2 calls for to develop
'lookup-node', is missing from language "HtDP advanced student."

I tried saving --

#lang scheme
(provide assf)

-- as a module file and adding it as a teachpack, but that didn't

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