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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)