Francisco Coelho / zugzwang

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code/asp/drafts/onabove.lp 76 Bytes
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3e0f9b8a   Francisco Coelho   back to work? 
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on(a,b).
on(b,c).

above(X,Y) :- on(X,Y).
above(X,Y) :- on(X,Z), above(Z,Y).