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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)