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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very hard (0)