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In the given context, we have a table named 'station' which contains a column 'city'. The problem is to find out all the unique city names that start and end with a vowel. The vowels considered here are 'a', 'e', 'i', 'o', 'u'.
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The solution uses a SQL query to solve the problem. The 'distinct' keyword is used to ensure that only unique city names are returned. The 'left' and 'right' functions are used to check the first and last character of the city name respectively. The 'in' keyword is used to check if these characters are in the set of vowels ('a', 'e', 'i', 'o', 'u').
select distinct city from station where left(city,1) in('a','e','i','o','u') and right(city,1) in('a','e','i','o','u')
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