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덧셈: 2 + 1

1

		4	7
			1
		4	8

2

		2	5
			1
		2	6

3

		5	5
			3
		5	8

4

		2	1
			8
		2	9

5

		3	6
			3
		3	9

6

		9	1
			1
		9	2

7

		8	6
			1
		8	7

8

		3	5
			3
		3	8

9

		1	4
			7
		2	1

10

		5	3
			8
		6	1

11

		2	8
			1
		2	9

12

		1	3
			5
		1	8

13

		2	8
			5
		3	3

14

		4	6
			7
		5	3

15

		9	3
			3
		9	6

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