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곱셈: 2 x 21X4

1

		1	4
		5	2
		2	8
	7	0	0
	7	2	8

2

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

3

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

4

		6	0
		6	6
	3	6	0
3	6	0	0
3	9	6	0

5

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

6

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

7

		4	4
		1	0
			0
	4	4	0
	4	4	0

8

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

9

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

10

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

11

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

12

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

13

		4	3
		8	7
	3	0	1
3	4	4	0
3	7	4	1

14

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

15

		4	5
		2	0
			0
	9	0	0
	9	0	0

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