Съпоставяне на семантични мрежи
% is_a hierarchy
isa(square,rectangle).
isa(rectangle,4-side).
isa(trapezoid,4-side).
isa(parallelogram,4-side).
isa(circle,oval).
isa(ellipse,oval).
isa(triangle,polygon).
isa(4-side,polygon).
isa(polygon,figure).
isa(oval,figure).
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