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곱셈: 2 x 21X4

1

		1	4
		9	2
		2	8
1	2	6	0
1	2	8	8

2

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

3

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

4

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

5

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

6

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

7

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

8

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

9

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

10

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

11

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

12

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

13

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

14

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

15

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

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