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곱셈: 2 x 12X4

		2	4
			1
		2	4

	5	3
		6
3	1	8

	8	2
		5
4	1	0

		1	4
			7
		9	8

		2	2
			1
		2	2

	4	4
		6
2	6	4

		1	4
			5
		7	0

		3	6
			2
		7	2

	3	4
		8
2	7	2

	1	8
		8
1	4	4

		2	0
			2
		4	0

		4	1
			2
		8	2

	9	6
		4
3	8	4

	8	7
		3
2	6	1

		1	8
			1
		1	8