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곱셈: 2 x 21X5

1

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

2

		5	9
		2	0
			0
1	1	8	0
1	1	8	0

3

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

4

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

5

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

6

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

7

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

8

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

9

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

10

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

11

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

12

		1	5
		6	1
		1	5
	9	0	0
	9	1	5

13

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

14

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

15

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

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