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곱셈: 2 x 12X7

	2	7
		6
1	6	2

		2	3
			1
		2	3

		3	1
			2
		6	2

		3	0
			2
		6	0

		3	8
			2
		7	6

	2	5
		5
1	2	5

	3	5
		6
2	1	0

		2	9
			2
		5	8

		5	5
			1
		5	5

	6	1
		6
3	6	6

		3	1
			1
		3	1

	9	0
		5
4	5	0

		4	9
			1
		4	9

	6	4
		3
1	9	2

	9	0
		5
4	5	0