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곱셈: 2 x 21X7

1

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

2

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

3

		8	1
		7	9
	7	2	9
5	6	7	0
6	3	9	9

4

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

5

		8	9
		4	2
	1	7	8
3	5	6	0
3	7	3	8

6

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

7

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

8

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

9

		1	3
		1	5
		6	5
	1	3	0
	1	9	5

10

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

11

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

12

		6	1
		8	1
		6	1
4	8	8	0
4	9	4	1

13

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

14

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

15

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

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