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malcin
Mar 23rd, 2017
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  1. :- op(2, xfy, -).
  2. gr(g).
  3. gr(z).
  4. check(X - Y):-
  5.     (gr(X) ; gr(Y)).
  6.  
  7. ?- check(g - z).
  8. true ;
  9. true.
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