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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)