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곱셈: 2 x 21X5

1

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

2

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

3

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

4

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

5

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

6

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

7

		9	0
		1	9
	8	1	0
	9	0	0
1	7	1	0

8

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

9

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

10

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

11

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

12

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

13

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

14

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

15

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

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