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