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곱셈: 2 x 12X4

		2	4
			3
		7	2

	4	0
		9
3	6	0

	6	2
		2
1	2	4

	3	5
		6
2	1	0

	6	9
		8
5	5	2

		2	8
			1
		2	8

	4	9
		9
4	4	1

	8	7
		6
5	2	2

		2	3
			2
		4	6

	9	2
		3
2	7	6

	2	2
		5
1	1	0

	5	8
		6
3	4	8

		2	8
			1
		2	8

	3	0
		8
2	4	0

	2	7
		7
1	8	9