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

Difficulty: Very easy (0)

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

Difficulty: Harder (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)