(
   ( rel 
      ( tuple 
         (
            ( SName  string )
            ( Bev  int )
            ( PLZ  int )
            ( Vorwahl  string )
            ( Kennzeichen  string ))))
   (
      ( "Mainz"  189000  6500  "06131"  "MZ" )
      ( "Mannheim"  295000  6800  "0621"  "MA" )
      ( "Moenchengladbach"  254000  4050  "02161"  "MG" )
      ( "Muehlheim(Ruhr)"  172000  4330  "0208"  "MH" )
      ( "Muenchen"  1267000  8000  "089"  "M" )
      ( "Muenster"  270000  4400  "0251"  "MS" )
      ( "Nuernberg"  465000  8500  "0911"  "N" )
      ( "Offenbach(Main)"  107000  6050  "069"  "OF" )
      ( "Oldenburg"  138000  2900  "0441"  "OL" )
      ( "Osnabrueck"  153000  4500  "0541"  "OS" )))