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