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곱셈: 2 x 21X7

1

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

2

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

3

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

4

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

5

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

6

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

7

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

8

		5	7
		5	5
	2	8	5
2	8	5	0
3	1	3	5

9

		1	0
		2	0
			0
	2	0	0
	2	0	0

10

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

11

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

12

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

13

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

14

		4	1
		3	2
		8	2
1	2	3	0
1	3	1	2

15

		4	1
		1	4
	1	6	4
	4	1	0
	5	7	4

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