3
			6		1		7
			5		2	3
		6
					3
	4	5		1
2		8		5
							2

Difficulty: Very hard (0)

			4		7	5
			8
	3	2	7				8
5				7	1	8
				8
	2	8		4

Difficulty: Very hard (0)

	3				1
						5
				8			4
7				4		1	3
3	6		7				2
1			8
	2
		1				6

Difficulty: Very easy (0)

2		5			3
	6				4
					2		1
							3
1
6		1
		3				6
		2			7		4

Difficulty: Very hard (0)