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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)