text: --Weather Observation Station 8
  --https://www.hackerrank.com/challenges/weather-observation-station-8/problem
  
  SELECT DISTINCT(city)
  FROM(
      SELECT DISTINCT(city)
      FROM station
      WHERE city like '%a'
          or city like '%e'
          or city like '%i'
          or city like '%o'
          or city like '%u') as sub_query
      WHERE city like 'a%'
          or city like 'e%'
          or city like 'i%'
          or city like 'o%'
          or city like 'u%';
  