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곱셈: 2 x 12X7

	2	7
		7
1	8	9

		2	0
			1
		2	0

		4	0
			2
		8	0

	5	2
		2
1	0	4

	9	8
		3
2	9	4

	7	3
		4
2	9	2

		3	7
			1
		3	7

	8	2
		3
2	4	6

		5	8
			1
		5	8

		1	6
			5
		8	0

		2	6
			1
		2	6

	9	2
		7
6	4	4

	2	3
		6
1	3	8

	8	8
		4
3	5	2

	9	5
		5
4	7	5