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  1. blond(X) :-
  2. father(Father, X),
  3. blond(Father),
  4. mother(Mother, X),
  5. blond(Mother).
  6.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
/home/lfQ5OQ/gplc0aOCib.o: In function `predicate(blond/1)':
(.text+0x48): undefined reference to `predicate(father/2)'
/home/lfQ5OQ/gplc0aOCib.o: In function `predicate(blond/1)':
(.text+0x8f): undefined reference to `predicate(mother/2)'
collect2: ld returned 1 exit status
compilation failed
stdout
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Standard output is empty
https://ideone.com/it35f
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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