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adding doubles

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  • 9+9 =
    18
  • 4+4 =
    8
  • 7+7 =
    14
  • 0+0 =
    0
  • 10+10 =
    20
  • 6+6 =
    12
  • 5+5 =
    10
  • 3+3 =
    6
  • 2+2 =
    4
  • 8+8 =
    16
  • 1+1 =
    2
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