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70=7*10=7*2*5
60=6*10=2*3*2*5
42=6*7=2*3*7
70= 5 x 14 = 5 x 2 x 7
60= 3 x 20 = 3 x 4 x 5 = 3 x 2 x 2 x 5
42= 6 x 7 = 2 x 3 x 7