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곱셈: 2 x 12X7

	2	7
		4
1	0	8

		1	4
			3
		4	2

	5	3
		8
4	2	4

		6	9
			1
		6	9

	6	9
		3
2	0	7

	8	9
		2
1	7	8

		2	0
			4
		8	0

		2	8
			2
		5	6

	6	7
		3
2	0	1

		6	7
			1
		6	7

	5	3
		4
2	1	2

	5	3
		6
3	1	8

	2	7
		5
1	3	5

	5	8
		7
4	0	6

		1	3
			6
		7	8