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
  75
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5
  65
    1
  64
6
  21
    3
  18
7
  38
    3
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8
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  36
9
  81
    2
  79
10
  83
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  79
11
  63
    2
  61
12
  57
    2
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13
  44
    7
  37
14
  44
    6
  38
15
  15
    7
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