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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Harder (0)

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

Difficulty: Very easy (0)