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곱셈: 2 x 21X4

1

		1	4
		4	5
		7	0
	5	6	0
	6	3	0

2

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

3

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

4

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

5

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

6

		1	3
		9	1
		1	3
1	1	7	0
1	1	8	3

7

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

8

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

9

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

10

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

11

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

12

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

13

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

14

		7	6
		1	6
	4	5	6
	7	6	0
1	2	1	6

15

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

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