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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)