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곱셈: 2 x 21X4

1

		1	4
		5	5
		7	0
	7	0	0
	7	7	0

2

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

3

		1	6
		1	1
		1	6
	1	6	0
	1	7	6

4

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

5

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

6

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

7

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

8

		2	3
		4	0
			0
	9	2	0
	9	2	0

9

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

10

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

11

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

12

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

13

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

14

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

15

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

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