prolog/problems/family_relations/ancestor_2/common.py


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# coding=utf-8

id = 100
group = 'family_relations'
number = 7
visible = True
facts = 'family_relations'

solution = '''\
ancestor(X, Y) :-
  parent(X, Y).
ancestor(X, Y) :-
  parent(X, Z),
  ancestor(Z, Y).
'''