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