+--> Fizika
  | | ---> PAU
  | | | +--> 2E
  | | | +--> 3E
  | | | +--> 4E
  | | +--> SJZ
  |   |--> 2.c
  |   |--> 2.e
  |   |--> 4.a
  |   |--> 4.b
  |   |--> 4.c
  |   |--> 4.d
  |   `--> 4.e
  +--> TZK