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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)