4x2=8, 2x4=8, , 9x1=9, 3x3=9, , 4x1=4, 1x4=4, , 2x5=10, 5x2=10, , 8x2=16, 2x8=16, , 8x2=16, 2x8=16, , 3x6=18, 6x3=18, , 3x5=15, 5x3=15.

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