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곱셈: 2 x 21X7

1

		1	7
		9	1
		1	7
1	5	3	0
1	5	4	7

2

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

3

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

4

		4	5
		4	4
	1	8	0
1	8	0	0
1	9	8	0

5

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

6

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

7

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

8

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

9

		8	2
		4	9
	7	3	8
3	2	8	0
4	0	1	8

10

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

11

		8	4
		7	9
	7	5	6
5	8	8	0
6	6	3	6

12

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

13

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

14

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

15

		5	0
		6	3
	1	5	0
3	0	0	0
3	1	5	0

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