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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)