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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)