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곱셈: 2 x 21X9

1

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

2

		3	0
		2	0
			0
	6	0	0
	6	0	0

3

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

4

		3	1
		8	6
	1	8	6
2	4	8	0
2	6	6	6

5

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

6

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

7

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

8

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

9

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

10

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

11

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

12

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

13

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

14

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

15

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

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