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yap-6.3/Logtalk/examples/shapes/ch/square.lgt

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:- object(square,
instantiates(class),
specializes(regular_polygon)).
:- info([
author is 'Paulo Moura',
version is 1.0,
date is 2003/2/3,
comment is 'Geometric square.']).
nsides(4).
area(Area) :-
::side(Side),
Area is Side*Side.
:- end_object.