3	5
		1
					6
4
			2
			4	5

Difficulty: Very easy (0)

1	4
		3
	1
				5
			5
				6	4

Difficulty: Very hard (0)

	4	6
				4
	5
			1	2

Difficulty: Very easy (0)

5
		3		5
					4
6
	2		5
					3

Difficulty: Very easy (0)