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