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곱셈: 2 x 21X8

1

		1	8
		1	5
		9	0
	1	8	0
	2	7	0

2

		2	2
		4	9
	1	9	8
	8	8	0
1	0	7	8

3

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

4

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

5

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

6

		7	1
		9	0
			0
6	3	9	0
6	3	9	0

7

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

8

		1	5
		1	5
		7	5
	1	5	0
	2	2	5

9

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

10

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

11

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

12

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

13

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

14

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

15

		5	7
		8	5
	2	8	5
4	5	6	0
4	8	4	5

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