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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)