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([9],ANS)
choice([ ],ANS)
ANS=[ ]
choice([ ],[ ]).
巻取り段階