by 2's, 6, 8, 10, 12, 4, 5, 6, 7, 6, 9, 12, 15, by 3's, 10, 15, 20, 25, 6, 9, 12, 15, 8, 10, 12 ,14, by 4's, 6, 9, 12, 15, 15, 20, 25, 30, 8, 12, 16, 20, by 5's, 10, 15, 20, 25, 6, 8, 10, 12, 6, 9, 12, 15, by 6's, 12, 14, 16, 18, 12, 18, 24, 30, 10, 15, 20, 25, by 7's, 12, 18, 24, 30, 8, 12, 16, 20, 14, 21, 28, 35, by 8's, 15, 20, 25, 30, 16, 24, 32, 40, 14, 21, 28, 35, by 9's, 18, 27, 36, 45, 16, 24, 32, 40, 18, 20, 22, 24, by 10's, 10, 15, 20, 25, 15, 18, 21, 24, 20, 30, 40 ,50

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