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곱셈: 2 x 12X7

		2	7
			1
		2	7

	6	7
		6
4	0	2

		3	5
			2
		7	0

		9	3
			1
		9	3

	7	1
		5
3	5	5

	5	2
		4
2	0	8

	8	0
		2
1	6	0

	5	2
		6
3	1	2

	5	5
		4
2	2	0

	2	6
		6
1	5	6

		1	8
			5
		9	0

	4	6
		4
1	8	4

	9	2
		5
4	6	0

	2	8
		4
1	1	2

	3	4
		9
3	0	6