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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)