뺄셈: 2 - 1
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뺄셈: 2 - 1

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2
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3
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4
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  56
5
  45
    3
  42
6
  20
    6
  14
7
  40
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8
  16
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   8
9
  19
    2
  17
10
  64
    1
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11
  30
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  26
12
  84
    1
  83
13
  20
    3
  17
14
  85
    6
  79
15
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