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  • 7 - 6 =
    1
  • 25 - 7 =
    18
  • 20 - 12 =
    8
  • 19 - 4 =
    15
  • 17 - 9 =
    8
  • 19 - 5 =
    14
  • 28 - 13 =
    15
  • 28 - 10 =
    18
  • 12 - 3 =
    9
  • 3 - 1 =
    2
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