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곱셈: 2 x 21X0

1

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

2

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

3

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

4

		7	8
		1	8
	6	2	4
	7	8	0
1	4	0	4

5

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

6

		4	4
		1	0
			0
	4	4	0
	4	4	0

7

		3	0
		2	2
		6	0
	6	0	0
	6	6	0

8

		2	2
		8	5
	1	1	0
1	7	6	0
1	8	7	0

9

		8	0
		6	1
		8	0
4	8	0	0
4	8	8	0

10

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

11

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

12

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

13

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

14

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

15

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

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