2	4
2
3
					6
					5
	2	6

Difficulty: Very easy (0)

		1
		6
		2		1
	4		6
			3
			2

Difficulty: Very easy (0)

				3
			6		1
	3
				4
6		5
	1

Difficulty: Very easy (0)

	6	2
	5	1
			3	1
			5	4

Difficulty: Hard (0)