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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)