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

Difficulty: Easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)