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곱셈: 2 x 21X5

1

		1	5
		5	7
	1	0	5
	7	5	0
	8	5	5

2

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

3

		6	2
		4	5
	3	1	0
2	4	8	0
2	7	9	0

4

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

5

		7	3
		7	8
	5	8	4
5	1	1	0
5	6	9	4

6

		5	7
		8	6
	3	4	2
4	5	6	0
4	9	0	2

7

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

8

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

9

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

10

		1	0
		2	2
		2	0
	2	0	0
	2	2	0

11

		2	6
		1	0
			0
	2	6	0
	2	6	0

12

		7	6
		2	1
		7	6
1	5	2	0
1	5	9	6

13

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

14

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

15

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

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