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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)