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