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