prolog/problems/sets/diff_3/common.py


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id = 130
group = 'sets'
number = 37
visible = True
facts = None

solution = '''\
memb130(X, [X|_]).
memb130(X, [_|T]) :-
  memb130(X, T).

diff([], _, []).
diff([H|T], S2, [H|D]) :-
  \+ memb130(H, S2),
  diff(T, S2, D).
diff([H|T], S2, D) :-
  memb130(H, S2),
  diff(T, S2, D).
'''