6+6= - 12, 7+7= - 14, 8+8= - 16, 9+9= - 18, 10+10= - 20, 4+4= - 8, 3+3= - 6, 2+2= - 4, 1+1= - 2, 0+0= - 0, 4+5= - 9, 3+2= - 5, 6+7= - 13, 8+9= - 17, 5+2= - 7, 8+3= - 11, 9+1= - 10,

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