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  • 12-6=
    6
  • 1+1+6+7=
    15
  • 1+5=
    6
  • 7+8=
    15
  • 15+5=
    20
  • 14-5=
    9
  • 1+7-5=
    3
  • 3+16=
    19
  • 12+6=
    18
  • 3+5=
    8
  • 17-3
    14
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