5		2		6
	3
				5
2		4		3

Difficulty: Easy (0)

	4			2
1		3
	5
				4
			3		5
	1			3

Difficulty: Very hard (0)

2				5
	5				4
		3
			3
5				6
	6				2

Difficulty: Very easy (0)

2				1	4
		5	2
		2	3
1	2				5

Difficulty: Super easy (0)