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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)