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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)