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곱셈: 2 x 13X7

	3	7
		8
2	9	6

	5	9
		6
3	5	4

		1	1
			7
		7	7

	7	9
		3
2	3	7

		4	0
			2
		8	0

	6	2
		3
1	8	6

		1	0
			2
		2	0

		6	2
			1
		6	2

		2	5
			1
		2	5

		9	2
			1
		9	2

		3	4
			2
		6	8

	8	2
		4
3	2	8

	2	2
		9
1	9	8

	7	4
		8
5	9	2

	3	1
		4
1	2	4