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