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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)