| | +--> 1b
  | | +--> 2c
  | | `--> 4d
  +--> Fizika
  |   |--> 1A
  |   |--> 2A
  |   |--> 2C
  |   |--> 2D
  |   |--> 2E
  |   `--> 3D
  +--> TZK