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곱셈: 2 x 12X7

		2	7
			1
		2	7

		2	1
			1
		2	1

		9	8
			1
		9	8

	8	5
		4
3	4	0

	7	8
		4
3	1	2

	8	1
		6
4	8	6

		2	7
			1
		2	7

		3	1
			3
		9	3

	3	6
		5
1	8	0

		1	9
			5
		9	5

	5	2
		2
1	0	4

		1	5
			4
		6	0

	4	7
		7
3	2	9

	2	6
		9
2	3	4

		2	3
			3
		6	9