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Logtalk - Object oriented extension to Prolog
Release 2.22.3

Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
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% start by loading the necessary library and support example files (if not 
% already loaded):

| ?- logtalk_load([library(events_loader), library(types_loader), library(hierarchies_loader)]).
...

| ?- logtalk_load(roots(loader)).
...


% now you are ready for loading the example:

| ?- logtalk_load(relations(loader)).
...


% the objects in this example are used by several of the other examples.