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곱셈: 2 x 21X5

1

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

2

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

3

		5	5
		4	0
			0
2	2	0	0
2	2	0	0

4

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

5

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

6

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

7

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

8

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

9

		9	0
		5	0
			0
4	5	0	0
4	5	0	0

10

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

11

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

12

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

13

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

14

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

15

		6	1
		3	1
		6	1
1	8	3	0
1	8	9	1

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