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2 x 1
2 x 2
2 x 3
2 x 4
2 x 5
2 x 6
2 x 7
2 x 8
2 x 9
2 x 10
2 x 11
2 x 12
2 x 13
2 x 14
2 x 15
2 x 16
2 x 17
2 x 18
2 x 19
2 x 20