[plt-scheme] append-map examples

From: Ryan Culpepper (ryanc at ccs.neu.edu)
Date: Fri Apr 9 22:40:25 EDT 2010

Skeptic . wrote:
> Hi,
> Does someone knows canonical/pedagogical exemples of append-map except other than flatten ?

Collect a list of all the X in a Y.

eg, the list of free variables in a lambda term
eg, the list of links in a web page (as xexpr or sxml)
and so on


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