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곱셈: 2 x 21X5

1

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

2

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

3

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

4

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

5

		1	0
		6	0
			0
	6	0	0
	6	0	0

6

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

7

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

8

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

9

		3	3
		9	9
	2	9	7
2	9	7	0
3	2	6	7

10

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

11

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

12

		7	2
		1	1
		7	2
	7	2	0
	7	9	2

13

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

14

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

15

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

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