| | ---> 1b
  | | | |--> Ispit
  | | | ---> lab
  | | |   |--> EWB
  | | |   |--> vj12
  | | +--> 2c
  | | `--> 4d
  +--> Fizika
  | +--> 4.A
  | |--> 4.B
  | |--> 4.C
  | |--> 4.D
  | |--> 4.E
  +--> TZK