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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)