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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)