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