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yap-6.3/Logtalk/examples/polygons/NOTES

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Logtalk - Object oriented extension to Prolog
Release 2.25.1
Copyright (c) 1998-2005 Paulo Moura. All Rights Reserved.
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To load this example and for sample queries, please see the SCRIPT file.
In this example we have several types of polygons that can be concentric.
This is represented by a concentric binary relation ensuring that whenever
a polygon is moved towards a new position, all polygons likewise concentric
are moved along with them.