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곱셈: 2 x 12X5

	2	5
		8
2	0	0

	6	0
		4
2	4	0

	3	7
		8
2	9	6

		1	7
			3
		5	1

		1	2
			1
		1	2

	5	1
		6
3	0	6

	5	8
		3
1	7	4

	9	8
		2
1	9	6

	9	3
		3
2	7	9

	4	3
		3
1	2	9

		1	4
			3
		4	2

	2	8
		4
1	1	2

		4	1
			1
		4	1

	4	0
		4
1	6	0

		2	7
			2
		5	4