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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)