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곱셈: 2 x 21X7

1

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

2

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

3

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

4

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

5

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

6

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

7

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

8

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

9

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

10

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

11

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

12

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

13

		1	5
		7	7
	1	0	5
1	0	5	0
1	1	5	5

14

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

15

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

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