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곱셈: 2 x 12X5

	2	5
		8
2	0	0

	3	4
		8
2	7	2

	2	4
		9
2	1	6

	6	6
		6
3	9	6

		2	0
			4
		8	0

	9	0
		4
3	6	0

	2	4
		5
1	2	0

	4	0
		5
2	0	0

	5	1
		4
2	0	4

		3	0
			2
		6	0

	9	4
		7
6	5	8

	6	2
		8
4	9	6

	2	6
		6
1	5	6

	3	8
		8
3	0	4

	4	0
		4
1	6	0