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곱셈: 2 x 21X7

1

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

2

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

3

		9	4
		7	6
	5	6	4
6	5	8	0
7	1	4	4

4

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

5

		5	7
		2	2
	1	1	4
1	1	4	0
1	2	5	4

6

		9	2
		6	2
	1	8	4
5	5	2	0
5	7	0	4

7

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

8

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

9

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

10

		9	4
		5	0
			0
4	7	0	0
4	7	0	0

11

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

12

		3	4
		5	1
		3	4
1	7	0	0
1	7	3	4

13

		7	5
		8	0
			0
6	0	0	0
6	0	0	0

14

		5	8
		6	1
		5	8
3	4	8	0
3	5	3	8

15

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

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