prolog/problems/family_relations/descendant_2/common.py


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id = 101
group = 'family_relations'
number = 8
visible = True
facts = 'family_relations'

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