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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)