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

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