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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)