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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)