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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)