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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)