3	4
6		4	1
		1	2		3
5	1

Difficulty: Super easy (0)

					4
3			1		2
		5
			6
5		1			3
1

Difficulty: Super easy (0)

1		5
	2		3
		2		6
			6		1

Difficulty: Super easy (0)

		1	4
	2
				5
		4	6

Difficulty: Harder (0)