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곱셈: 2 x 21X7

1

		1	7
		5	5
		8	5
	8	5	0
	9	3	5

2

		9	0
		4	5
	4	5	0
3	6	0	0
4	0	5	0

3

		4	3
		6	4
	1	7	2
2	5	8	0
2	7	5	2

4

		5	5
		5	5
	2	7	5
2	7	5	0
3	0	2	5

5

		2	0
		3	5
	1	0	0
	6	0	0
	7	0	0

6

		5	6
		7	2
	1	1	2
3	9	2	0
4	0	3	2

7

		2	6
		3	7
	1	8	2
	7	8	0
	9	6	2

8

		3	3
		7	9
	2	9	7
2	3	1	0
2	6	0	7

9

		6	0
		1	4
	2	4	0
	6	0	0
	8	4	0

10

		6	4
		8	3
	1	9	2
5	1	2	0
5	3	1	2

11

		4	2
		6	3
	1	2	6
2	5	2	0
2	6	4	6

12

		7	6
		5	7
	5	3	2
3	8	0	0
4	3	3	2

13

		2	1
		5	0
			0
1	0	5	0
1	0	5	0

14

		2	8
		5	6
	1	6	8
1	4	0	0
1	5	6	8

15

		3	6
		3	9
	3	2	4
1	0	8	0
1	4	0	4

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