2 - 2X1=?, 4 - 2X2=?, 6 - 2X3=?, 8 - 2X4=?, 10 - 2X5=?, 12 - 2X6=?, 14 - 2X7=?, 16 - 2X8=?, 18 - 2X9=?, 20 - 2X10=?,

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