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Logtalk - Object oriented extension to Prolog
Release 2.22.1

Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
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To load this example and for sample queries, please see the SCRIPT file.

You will need to load the following files in the library directory: 
events_loader, types_loader, and hierarchies_loader. Alternatively, 
you may load the library all_loader file to load all library entities.