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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)