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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)