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