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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Hard (0)