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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)