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곱셈: 2 x 1

	7	1
		7
4	9	7

	1	2
		9
1	0	8

		1	1
			5
		5	5

	8	4
		3
2	5	2

	2	8
		8
2	2	4

	4	0
		3
1	2	0

		1	7
			5
		8	5

	2	3
		6
1	3	8

	2	4
		5
1	2	0

	4	1
		5
2	0	5

		4	0
			2
		8	0

	1	5
		8
1	2	0

		2	4
			3
		7	2

	4	2
		5
2	1	0

		1	2
			7
		8	4