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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)