| | +--> 1b
  | | +--> 2c
  | | `--> 4d
  +--> Fizika
  | | |--> 1A
  | | |--> 1B_ZIM
  | | +--> 3A
  | | +--> 3B
  | | +--> 3C
  | | +--> 4A
  | | +--> 4C
  +--> TZK