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뺄셈: 2 - 1

1

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			3
		2	4

2

		2	8
			3
		2	5

3

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			4
		3	3

4

		4	1
			1
		4	0

5

		1	2
			3
			9

6

		2	4
			1
		2	3

7

		6	5
			9
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8

		3	1
			6
		2	5

9

		8	6
			1
		8	5

10

		2	8
			3
		2	5

11

		4	1
			6
		3	5

12

		8	5
			4
		8	1

13

		2	4
			6
		1	8

14

		6	4
			6
		5	8

15

		1	1
			3
			8

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