| | +--> 1b
  | | +--> 2c
  | | `--> 4d
  +--> Fizika
  | | |--> 1b
  | | |--> 1c
  | | |--> 1d
  | | |--> 1e
  | | `--> 2bire
  | | |--> 1C
  | | |--> 2C
  | | |--> 4A
  | | |--> 4C
  +--> TZK