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곱셈: 2 x 21X5

1

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

2

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

3

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

4

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

5

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

6

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

7

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

8

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

9

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

10

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

11

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

12

		7	9
		5	5
	3	9	5
3	9	5	0
4	3	4	5

13

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

14

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

15

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

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