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곱셈: 2 x 21X7

1

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

2

		8	3
		1	7
	5	8	1
	8	3	0
1	4	1	1

3

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

4

		1	6
		2	0
			0
	3	2	0
	3	2	0

5

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

6

		2	2
		4	4
		8	8
	8	8	0
	9	6	8

7

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

8

		8	4
		1	0
			0
	8	4	0
	8	4	0

9

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

10

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

11

		1	6
		6	1
		1	6
	9	6	0
	9	7	6

12

		8	4
		4	0
			0
3	3	6	0
3	3	6	0

13

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

14

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

15

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

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