8	9
7			5				6	3	4
						4	10		5
2	5							1
	8	5					3	6	7
4	6	3					5	8
	4							10	2
1		8	10
8	2	7				3			6
					8	2

Difficulty: Hard (0)

6		9					3	7	4
4	2						8	9
		5		2	6		1		3
7							2
	1				3			8
	7			3				2
		7							6
9		1		8	5		10
	4	6						10	2
3	8	2					4		1

Difficulty: Very easy (0)

	4							2
			9
9	10						6	8
4			8	2		9	3		10
8			3		6		1	7	4
1	7	4		10		2			3
7		10	4		2	3			5
	2	3						4	1
						5
	6							1

Difficulty: Hard (0)

8			2		9				4
5	9				8		10	1	2
2		4	8
		6				10
	5			9			3	2
	1	2			6			7
			10				6
						4	1		7
10	2	3		6				8	1
7				8		9			3

Difficulty: Very easy (0)