8			6			1		3	11
				12				7
		3		10		11	7	2		4
9		1	8		10				4
7	11	5			9			1		6
			4	11							7
5							9	11
	4		3			8			6	1	9
		6				10		5	3		4
	3		7	2	11		8		1
			12				3
		9	5		12			4			2

Difficulty: Hard (0)

			12							10
1			3		10	2	5		9
8	5	4				6	7				3
			1	10			6	2		8
		10	2		3		12		4	1	11
						9			3
		5			6
10	8	9		3		5		12	2
	3		11	2			9	8
11				12	4				5	3	6
		12		5	2	3		7			9
	10							1

Difficulty: Easy (0)

	9	11		3	4	6
	6			5			8	11
7	4			2				6			10
9	2						11
6					12	8		1
3	10		1		2	7				11	12
10	5				3	9		4		1	11
			6		11	2					5
				8						7	3
5			4				1			3	6
			9	7			5			2
					10	3	2		1	4

Difficulty: Very easy (0)

	7		9				4	2		5
2		11			12					1
	6	4	10			2				12
12				9	6			5		4
	3						11		9
		9		2	3		1	7
			5	7		10	2		6
		6		5						7
	9		4			11	3				5
	11				7			10	5	9
	1					3			8		7
	2		8	4				12		11

Difficulty: Very easy (0)