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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Harder (0)