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곱셈: 2 x 21X7

1

		1	7
		1	5
		8	5
	1	7	0
	2	5	5

2

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

3

		9	1
		7	5
	4	5	5
6	3	7	0
6	8	2	5

4

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

5

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

6

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

7

		3	7
		5	2
		7	4
1	8	5	0
1	9	2	4

8

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

9

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

10

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

11

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

12

		1	5
		1	5
		7	5
	1	5	0
	2	2	5

13

		7	6
		4	2
	1	5	2
3	0	4	0
3	1	9	2

14

		6	1
		1	0
			0
	6	1	0
	6	1	0

15

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

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