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곱셈: 2 x 21X7

1

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

2

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

3

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

4

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

5

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

6

		5	9
		2	2
	1	1	8
1	1	8	0
1	2	9	8

7

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

8

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

9

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

10

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

11

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

12

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

13

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

14

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

15

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

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