text: -- Query the list of CITY names from STATION that either do not start with vowels or do not end with vowels. Your result cannot contain duplicates.
  
  -- Input Format
  
  -- The STATION table is described as follows:
  
  /*
  STATION
  
  Field   | Type
  --------|--------
  ID      | NUMBER
  CITY    | VARCHAR2(21)
  STATE   | VARCHAR2(2)
  LAT_N   | NUMBER
  LONG_W  | NUMBER
  
  where LAT_N is the northern latitude and LONG_W is the western longitude.
  */
  
  SELECT DISTINCT(CITY) FROM STATION WHERE CITY NOT RLIKE '^.*(a|e|i|o|u)$' OR NOT CITY RLIKE '^(a|e|i|o|u).*' ORDER BY CITY