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