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곱셈: 2 x 12X5

	2	5
		7
1	7	5

		4	3
			1
		4	3

	6	0
		9
5	4	0

		1	8
			2
		3	6

	4	7
		4
1	8	8

	2	1
		5
1	0	5

		2	4
			4
		9	6

	6	0
		2
1	2	0

	6	0
		3
1	8	0

		2	3
			3
		6	9

		4	9
			2
		9	8

		2	7
			2
		5	4

	7	4
		3
2	2	2

	9	4
		3
2	8	2

	8	0
		2
1	6	0