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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)