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

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