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  • 12-5
    7
  • 6+9
    15
  • 21-9
    12
  • 5+6
    11
  • 8+7
    15
  • 3+7
    10
  • 9+5
    14
  • 9+7
    16
  • 8-8
    0
  • 7-4
    3
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