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곱셈: 4 x 21X7

1

		1	7	5	8
				9	5
		8	7	9	0
1	5	8	2	2	0
1	6	7	0	1	0

2

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

3

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

4

		1	6	4	4
				7	5
		8	2	2	0
1	1	5	0	8	0
1	2	3	3	0	0

5

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

6

		1	2	5	1
				3	1
		1	2	5	1
	3	7	5	3	0
	3	8	7	8	1

7

		5	4	2	8
				5	3
	1	6	2	8	4
2	7	1	4	0	0
2	8	7	6	8	4

8

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

9

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

10

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

11

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

12

		9	2	2	7
				8	6
	5	5	3	6	2
7	3	8	1	6	0
7	9	3	5	2	2

13

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

14

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

15

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

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