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efectueaza prin procedeul preferat 23x3=,31x3=,33x2=,11x5=,42x2=,22x4=,44x2=,24x2=,12x6=,18x4=,23x4=,18x5=,35x2=,45x2=,37x2=,17x5=,49x2=,38x2=,47x2=,13x6=,27x3=,29x3=,26x3=,19x4=