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곱셈: 2 x 21X5

1

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

2

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

3

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

4

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

5

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

6

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

7

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

8

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

9

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

10

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

11

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

12

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

13

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

14

		3	1
		1	0
			0
	3	1	0
	3	1	0

15

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

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