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1º:1(2,3)(7,9)17(6,8,16,18)(4,10)-15(13,14)11-12,5
2º:(*1,3)(9,18)(2,17)(7,16)8(6,10)(4,14)-(15,11)13-12,5
3º:(*1,9)17(2,18)16,7(14,11)-(3,8,4)(10,15)-13,6=5
4º:17(9,18,11)(1,2,16,14)(7,8)(4,10)-15,13-(3,6)-5
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