solve(ANS,12).
choice([3,14,6,9],ANS),sum(ANS,12)
choice([3,14,6,9],ANS)
ANS=[0,14,6,9]
choice([14,6,9],ANS)
choice([6,9],ANS)
ANS=[0,14,6,9]
0+14+6+9=29
単一化に失敗
choice([6,9],ANS)
ANS=[6,9]
choice([9],ANS)
choice([],ANS)
choice([9],ANS)
ANS=[9]
choice([],ANS)
ANS=[]
choice([14,6,9],ANS)
ANS=[14,6,9]