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곱셈: 2 x 21X7

1

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

2

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

3

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

4

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

5

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

6

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

7

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

8

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

9

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

10

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

11

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

12

		9	2
		5	6
	5	5	2
4	6	0	0
5	1	5	2

13

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

14

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

15

		2	5
		5	2
		5	0
1	2	5	0
1	3	0	0

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