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