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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)