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뺄셈: 3 - 12-1

2	1	5
		8
2	0	7

5	4	7
		7
5	4	0

6	0	2
		1
6	0	1

6	1	9
		6
6	1	3

7	5	5
		5
7	5	0

5	3	1
		4
5	2	7

2	3	6
		6
2	3	0

2	3	1
		1
2	3	0

9	2	3
		1
9	2	2

2	1	4
		1
2	1	3

1	2	2
		2
1	2	0

8	3	6
		8
8	2	8

1	0	6
		3
1	0	3

7	1	6
		9
7	0	7

3	4	1
		1
3	4	0