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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)