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곱셈: 2 x 12X7

		2	7
			2
		5	4

	5	3
		5
2	6	5

	5	8
		7
4	0	6

	2	0
		8
1	6	0

	3	3
		7
2	3	1

		4	2
			2
		8	4

	2	5
		4
1	0	0

	2	8
		8
2	2	4

		2	7
			2
		5	4

		2	4
			4
		9	6

	5	0
		8
4	0	0

	3	3
		7
2	3	1

	2	1
		5
1	0	5

		1	2
			6
		7	2

	4	4
		9
3	9	6