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곱셈: 2 x 21X5

1

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

2

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

3

		4	4
		4	9
	3	9	6
1	7	6	0
2	1	5	6

4

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

5

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

6

		6	3
		9	4
	2	5	2
5	6	7	0
5	9	2	2

7

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

8

		1	5
		6	3
		4	5
	9	0	0
	9	4	5

9

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

10

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

11

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

12

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

13

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

14

		3	0
		6	4
	1	2	0
1	8	0	0
1	9	2	0

15

		5	3
		1	1
		5	3
	5	3	0
	5	8	3

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