solve(ANS,12).
choice2([3,14,6,9], [], ANS, 0, 12)
choice2([14,6,9], [0], ANS, 0, 12)
choice2([6,9], [0,0], ANS, 0, 12)
choice2([9], [0,0,0], ANS, 0, 12)
choice2([ ], [0,0,0,0], ANS, 0, 12)
choice2([ ],[9,0,0,0],ANS,9,12)
SUM=9,SUM=12 不一致
(失敗)
H=9,T=[ ],L=[0,0,0],
X=0,SUM=12
Y=9,Y=<12