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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)