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곱셈: 2 x 21X7

1

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

2

		8	1
		5	8
	6	4	8
4	0	5	0
4	6	9	8

3

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

4

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

5

		9	4
		1	2
	1	8	8
	9	4	0
1	1	2	8

6

		1	9
		5	3
		5	7
	9	5	0
1	0	0	7

7

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

8

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

9

		9	7
		4	9
	8	7	3
3	8	8	0
4	7	5	3

10

		1	9
		1	4
		7	6
	1	9	0
	2	6	6

11

		1	5
		7	5
		7	5
1	0	5	0
1	1	2	5

12

		6	7
		5	9
	6	0	3
3	3	5	0
3	9	5	3

13

		4	1
		5	1
		4	1
2	0	5	0
2	0	9	1

14

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

15

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

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