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뺄셈: 2 - 1

1

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			2
		1	1

2

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			6
		3	8

3

		1	6
			9
			7

4

		2	5
			4
		2	1

5

		5	1
			7
		4	4

6

		1	8
			3
		1	5

7

		9	3
			2
		9	1

8

		6	7
			5
		6	2

9

		7	1
			9
		6	2

10

		3	6
			7
		2	9

11

		2	3
			2
		2	1

12

		5	6
			1
		5	5

13

		6	8
			2
		6	6

14

		9	9
			1
		9	8

15

		3	7
			4
		3	3

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