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곱셈: 2 x 21X9

1

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

2

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

3

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

4

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

5

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

6

		7	5
		4	4
	3	0	0
3	0	0	0
3	3	0	0

7

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

8

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

9

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

10

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

11

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

12

		1	3
		1	3
		3	9
	1	3	0
	1	6	9

13

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

14

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

15

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

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