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곱셈: 2 x 21X4

1

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

2

		2	5
		2	4
	1	0	0
	5	0	0
	6	0	0

3

		4	8
		7	4
	1	9	2
3	3	6	0
3	5	5	2

4

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

5

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

6

		9	6
		5	0
			0
4	8	0	0
4	8	0	0

7

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

8

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

9

		9	9
		2	0
			0
1	9	8	0
1	9	8	0

10

		2	1
		1	0
			0
	2	1	0
	2	1	0

11

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

12

		2	4
		2	4
		9	6
	4	8	0
	5	7	6

13

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

14

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

15

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

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