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곱셈: 2 x 12X4

	2	4
		8
1	9	2

	5	8
		2
1	1	6

	2	8
		7
1	9	6

		2	6
			2
		5	2

	7	2
		5
3	6	0

	7	2
		9
6	4	8

	4	4
		6
2	6	4

	3	9
		7
2	7	3

	2	1
		5
1	0	5

		2	0
			4
		8	0

	1	8
		9
1	6	2

	3	0
		9
2	7	0

		2	9
			1
		2	9

	9	5
		4
3	8	0

	7	7
		6
4	6	2