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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)