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