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곱셈: 2 x 21X0

1

		1	0
		4	6
		6	0
	4	0	0
	4	6	0

2

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

3

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

4

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

5

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

6

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

7

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

8

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

9

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

10

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

11

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

12

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

13

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

14

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

15

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

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