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  1.  
  2. likes(kim,robin).
  3. likes(sandy,kim).
  4. likes(sandy,X) :- people(X), likes(X, cats).
  5. likes(sandy,X) :- animal(X), likes(X, cats).
  6. likes(kim,X) :-  people(X), likes(X, lee), likes(X, kim).
  7. likes(sandy,lee).
  8. likes(X,X) :- people(X).
  9. likes(X,X) :- animal(X).
  10.  
  11. people(kim).
  12. people(robin).
  13. people(sandy).
  14. people(lee).
  15. animal(cats).
  16.  
  17. main :-
  18. 	likes(sandy, X),
  19. 	writeln(X),
  20.     fail.
  21.  
  22. :- main.
  23.  
Success #stdin #stdout #stderr 0.02s 6204KB
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stdin
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Standard input is empty
stdout
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kim
sandy
cats
lee
sandy
stderr
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Warning: /home/qb3Iep/prog.pl:22:
	Goal (directive) failed: user:main
https://ideone.com/8JG2Hb
language:
Prolog (swi 7.6.4)
created:
9 years ago
visibility:
public

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