2 - 2x1= , 4 - 2x2=, 6 - 2x3= , 8 - 2x4=, 10 - 2x5= , 12 - 2x6= , 14 - 2x7=, 16 - 2x8= , 18 - 2x9=, 20 - 2x10= ,

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