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from preamble:
"Change Set: converse-raok Date: 2 October 2002 Author: Richard A. O'Keefe
There are applications, like reserving a sorted collection, or sorting in reverse order, but not limited to those, where we would like to take the converse of a predicate. The converse of a function f : (x, y) -> z is a function converse(f) : (y, x) -> z.
This change set adds a class BinaryBlockConverse and methods so that aBlock converse value: x value: y = aBlock value: y value: x. This version adds BinaryBlockConverse>>fixTemps."!
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