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곱셈: 2 x 21X7

1

		1	7
		4	1
		1	7
	6	8	0
	6	9	7

2

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

3

		1	3
		4	9
	1	1	7
	5	2	0
	6	3	7

4

		1	5
		5	4
		6	0
	7	5	0
	8	1	0

5

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

6

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

7

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

8

		9	4
		1	7
	6	5	8
	9	4	0
1	5	9	8

9

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

10

		3	3
		5	8
	2	6	4
1	6	5	0
1	9	1	4

11

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

12

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

13

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

14

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

15

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

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