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