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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)