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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)