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곱셈: 2 x 21X5

1

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

2

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

3

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

4

		1	3
		3	1
		1	3
	3	9	0
	4	0	3

5

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

6

		3	3
		9	1
		3	3
2	9	7	0
3	0	0	3

7

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

8

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

9

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

10

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

11

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

12

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

13

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

14

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

15

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

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