1x2=, 2, 1, 2x2=, 8, 4, 3, 3x2=, 5, 6, 4x2=, 8, 6, 5x2=, 12, 10, 7, 6x2=, 10, 12, 8, 7x2=, 12, 14, 16, 8x2=, 12, 16, 9x2=, 16, 18, 10x2=, 15, 20, 10

Multiplication by 2

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