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곱셈: 4 x 21X2

1

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

2

		3	0	1	5
				5	6
	1	8	0	9	0
1	5	0	7	5	0
1	6	8	8	4	0

3

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

4

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

5

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

6

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

7

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

8

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

9

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

10

		7	2	8	5
				4	5
	3	6	4	2	5
2	9	1	4	0	0
3	2	7	8	2	5

11

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

12

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

13

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

14

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

15

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

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