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곱셈: 2 x 12X5

	2	5
		7
1	7	5

	5	2
		8
4	1	6

	2	9
		6
1	7	4

	9	9
		2
1	9	8

	2	3
		5
1	1	5

		1	7
			1
		1	7

	4	7
		5
2	3	5

		3	2
			1
		3	2

		6	0
			1
		6	0

		2	7
			1
		2	7

	6	0
		6
3	6	0

	4	0
		7
2	8	0

		2	2
			4
		8	8

	4	1
		7
2	8	7

	5	3
		2
1	0	6