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

Difficulty: Harder (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)