from preamble:

"Change Set:		mapcan
Date:			23 June 2003
Author:			Richard A. O'Keefe

This adds a method #concatenation to
SequenceableCollection so that a sequence
of collections can be concatenated to form
a single Array.  Brian Pinkney needed a
Squeak analogue of the Common Lisp
#'mapcan function, and
(seq collect: aBlock) concatenation
seemed like the simplest and most reusable
way to do it."!
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