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곱셈: 2 x 21X7

1

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

2

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

3

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

4

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

5

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

6

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

7

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

8

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

9

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

10

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

11

		9	5
		1	0
			0
	9	5	0
	9	5	0

12

		1	5
		2	4
		6	0
	3	0	0
	3	6	0

13

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

14

		6	3
		8	0
			0
5	0	4	0
5	0	4	0

15

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

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