1
			2
	6		5
		1		4
		5
		4

Difficulty: Very easy (0)

2	3
	5
	2
				1
				6
				4	3

Difficulty: Very easy (0)

			1
				2
1	4		5
		3		1	2
	1
		5

Difficulty: Medium (0)

2		5			3
	3
				6
1			2		4

Difficulty: Very easy (0)