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뺄셈: 2 - 1

1

		1	4
			5
			9

2

		6	2
			7
		5	5

3

		2	6
			2
		2	4

4

		5	2
			5
		4	7

5

		2	6
			3
		2	3

6

		2	1
			3
		1	8

7

		3	6
			1
		3	5

8

		3	4
			3
		3	1

9

		7	8
			1
		7	7

10

		8	5
			4
		8	1

11

		7	1
			3
		6	8

12

		4	4
			9
		3	5

13

		3	4
			1
		3	3

14

		6	4
			8
		5	6

15

		1	6
			2
		1	4

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