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  1. ist_lieb(sandra).
  2. ist_guter_freund(X) :- ist_lieb(X).
  3.  
  4. ?- ist_guter_freund(sandra).
Success #stdin #stdout 0.02s 6204KB
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https://ideone.com/ogzsk
language:
Prolog (swi 7.6.4)
created:
14 years ago
visibility:
public

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