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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)