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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5
  57
    3
  54
6
  30
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7
  43
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8
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9
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  54
10
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11
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  45
12
  42
    6
  36
13
  74
    7
  67
14
  85
    9
  76
15
  84
    6
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