idnr: 644

3			1
	1
		2
2			4

Difficulty: Super easy (0)

idnr: 271

	2		1


4		3

Difficulty: Super easy (0)

idnr: 443

1	2


		4	3

Difficulty: Super easy (0)

idnr: 552

		1	3


2	4

Difficulty: Super easy (0)