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