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곱셈: 2 x 21X4

1

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

2

		3	2
		3	5
	1	6	0
	9	6	0
1	1	2	0

3

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

4

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

5

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

6

		1	7
		3	6
	1	0	2
	5	1	0
	6	1	2

7

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

8

		5	0
		5	4
	2	0	0
2	5	0	0
2	7	0	0

9

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

10

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

11

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

12

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

13

		8	9
		2	1
		8	9
1	7	8	0
1	8	6	9

14

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

15

		4	5
		5	0
			0
2	2	5	0
2	2	5	0

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