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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)