덧셈: 2 + 1
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덧셈: 2 + 1

1
  18
    2
  20
2
  63
    6
  69
3
  62
    7
  69
4
  33
    4
  37
5
  22
    2
  24
6
  22
    2
  24
7
  20
    2
  22
8
  18
    1
  19
9
  37
    1
  38
10
  13
    2
  15
11
  52
    4
  56
12
  45
    6
  51
13
  18
    5
  23
14
  41
    4
  45
15
  18
    5
  23
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