prolog/problems/sets/union_3/common.py


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# coding=utf-8

id = 128
number = 35
visible = True
facts = None

solution = '''\
memb128(X, [X|_]).
memb128(X, [_|T]) :-
  memb128(X, T).

union([], S2, S2).
union([H|T], S2, [H|U]) :-
  \+ memb128(H, S2),
  union(T, S2, U).
union([H|T], S2, U) :-
  memb128(H, S2),
  union(T, S2, U).
'''