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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)