5		1	3
				2
	6
	2	3		4

Difficulty: Very easy (0)

					1
			2
		4	5
		2	6
		1
6

Difficulty: Medium (0)

2
			1	6
			3
		2
	1	5
					1

Difficulty: Super easy (0)

				3
				5
4			3
		1			2
	4
	6

Difficulty: Very easy (0)