solve(ANS,12).
choice([3,14,6,9],ANS),sum(ANS,12)
choice([3,14,6,9],ANS)
choice([14,6,9],ANS)
choice([6,9],ANS)
choice([H|T],[0|Y]):-choice(T,Y).
H=14, T=[6,9], ANS=[0|Y]
巻取り段階