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3 x 5 x 7 x 8
2 x 6 x 7 x 10
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840=2*2*2*3*5*7
7*5*4*3*2 Is the longest factor string of 840
2 x 420 3 x 280 4 x 210 5 x 168 6 x 140
2 x 2 x 2 x 3 x 5 x 7