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  1. parent( mary, john ).
  2. parent( ann, mary ).
  3. female( mary).
  4. mother( X, Y) :- parent( X, Y), female( X).
  5. grandparent( X, Y) :- parent( X, Z), parent( Z, Y).
  6. ?-female (mary).
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.pl:6:3: syntax error: . or operator expected after expression
	1 error(s)
compilation failed
stdout
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Standard output is empty
https://ideone.com/dtmqN
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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