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곱셈: 2 x 21X9

1

		1	9
		5	0
			0
	9	5	0
	9	5	0

2

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

3

		4	9
		1	0
			0
	4	9	0
	4	9	0

4

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

5

		3	0
		3	3
		9	0
	9	0	0
	9	9	0

6

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

7

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

8

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

9

		4	6
		2	0
			0
	9	2	0
	9	2	0

10

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

11

		5	5
		3	3
	1	6	5
1	6	5	0
1	8	1	5

12

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

13

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

14

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

15

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

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