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