idnr: 173

			4
3
			1
2

Difficulty: Super easy (0)

idnr: 644

3			1
	1
		2
2			4

Difficulty: Super easy (0)

idnr: 157

	3		1


4		2

Difficulty: Super easy (0)

idnr: 550

	3	4
4
			1
	1	2

Difficulty: Super easy (0)