뺄셈: 2 - 1
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뺄셈: 2 - 1

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2
  54
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3
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4
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5
  42
    9
  33
6
  46
    4
  42
7
  62
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  54
8
  62
    5
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9
  51
    4
  47
10
  82
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  74
11
  35
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  31
12
  43
    3
  40
13
  54
    9
  45
14
  54
    8
  46
15
  92
    7
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