+--> Fizika
  | | +--> 1A
  | | +--> 1C
  | | +--> 2A
  | | +--> 3A
  | | +--> 4A
  | | |--> 1C
  | | |--> 2C
  | | |--> 4A
  | | |--> 4C
  +--> TZK