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뺄셈: 2 - 1

1

		1	7
			5
		1	2

2

		3	5
			8
		2	7

3

		1	2
			6
			6

4

		4	4
			5
		3	9

5

		3	4
			3
		3	1

6

		3	1
			4
		2	7

7

		3	6
			3
		3	3

8

		1	2
			8
			4

9

		3	6
			9
		2	7

10

		2	8
			3
		2	5

11

		2	1
			9
		1	2

12

		6	7
			3
		6	4

13

		7	2
			4
		6	8

14

		5	9
			5
		5	4

15

		8	1
			3
		7	8

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