5 group of 2, 5 x 2 = 10, 8 group of 2, 8 x 2 = 16, 6 group of 2, 6 x 2 = 12, 20, 10 group of 2, 12, 6 group of 2, 14, 7 group of 2, 9 x 2, 18, 4 x 2, 8

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