+--> Fizika
  | `--> 3. A
  | | ---> PAU
  | | | +--> 2E
  | | | +--> 3E
  | | | +--> 4E
  | | ---> SJZ
  | |   +--> 4e
  | | |--> 1C
  | | |--> 2C
  | | |--> 4A
  | | |--> 4C
  +--> TZK