9,2,5,10
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15,2,12,(6,8)
9,5,4
8,12,4,(7)
8,2,9,(7,13,14)
2,12,15,11
5,10,13,(15,8,16)
6,7
13,5,2,(12,4)
15,1,(17,6,2,18)
11,13,5,3,14