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

Difficulty: Harder (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)