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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)