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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Hard (0)