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