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곱셈: 2 x 21X5

1

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

2

		2	0
		2	1
		2	0
	4	0	0
	4	2	0

3

		6	5
		6	7
	4	5	5
3	9	0	0
4	3	5	5

4

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

5

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

6

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

7

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

8

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

9

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

10

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

11

		5	7
		1	0
			0
	5	7	0
	5	7	0

12

		1	6
		8	1
		1	6
1	2	8	0
1	2	9	6

13

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

14

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

15

		8	7
		4	7
	6	0	9
3	4	8	0
4	0	8	9

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