| | ---> 1b
  | | | |--> Ispit
  | | | ---> lab
  | | |   |--> EWB
  | | |   |--> vj12
  | | +--> 2c
  | | `--> 4d
  +--> Fizika
  | | |--> 1b
  | | |--> 1c
  | | |--> 1d
  | | |--> 1e
  | | `--> 2bire
  +--> TZK