4
	2			5
				3
	5
	1			4
		2

Difficulty: Very easy (0)

			4
					3
1		6
			1		2
5
		1

Difficulty: Very easy (0)

				1
				5	2
			2	6
	2	4
5	6
	4

Difficulty: Super easy (0)

		6
4					5
	3
				2
1					3
			1

Difficulty: Very hard (0)