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  1. parent(john, mary).
  2. parent(mary, susan).
  3. grandparent(X, Y) :- parent(X, Z), parent(Z, Y).
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin 
Standard input is empty
stdout 
GNU Prolog 1.4.5 (64 bits)
Compiled Feb  5 2017, 10:30:08 with gcc
By Daniel Diaz
Copyright (C) 1999-2016 Daniel Diaz
| ?-
https://ideone.com/ZkyYjT
grandparent(X, Y)
language:
Prolog (gprolog 1.4.5)
created:
18 hours ago
visibility:
public

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