| | +--> 1D
  | | |--> 2C
  | | +--> 2D
  | | |--> 3C
  | | |--> 3D
  | | `--> 4C
  | | |--> OE 1
  | | |--> OE 2
  | | |--> OU
  | | |--> PLU
  | | |--> SEI
  | | |--> Test
  +--> Fizika
  +--> TZK