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

Difficulty: Very hard (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)