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곱셈: 2 x 21X4

1

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

2

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

3

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

4

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

5

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

6

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

7

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

8

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

9

		7	3
		4	6
	4	3	8
2	9	2	0
3	3	5	8

10

		4	5
		2	0
			0
	9	0	0
	9	0	0

11

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

12

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

13

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

14

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

15

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

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