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