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  1. dancer(175, "c", m, bob).
  2. dancer(180, "b", m, anthony).
  3. dancer(160, "d", m, paul).
  4. dancer(160, "e", m, nick).
  5. dancer(176, "a", m, fred).
  6.  
  7. dancer(172, "b", f, mary).
  8. dancer(170, "c", f, ann).
  9. dancer(165, "d", f, louise).
  10. dancer(168, "c", f, natalie).
  11. dancer(158, "a", f, claudia).
  12.  
  13. partner(X, Y) :-
  14. dancer(A, B, f, X), dancer(C, D, m, Y), Diff is C - A, Diff =< 10, A < C, B =< D.
  15.  
Success #stdin #stdout #stderr 0s 30888KB
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Standard input is empty
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Standard output is empty
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ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/XgikyA
language:
Prolog (swi 7.6.4)
created:
6 years ago
visibility:
public

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