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okay, after thinking through the problem, you'ld realize that the problem is about querying a list of city names without DUPLICATES.
This can be achieved by using the 'DISTINCT' keyword after SELECT before CITY.
SELECT DISTINCT CITY
FROM STATION
WHERE mod(ID, 2)= 0;
Weather Observation Station 3
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okay, after thinking through the problem, you'ld realize that the problem is about querying a list of city names without DUPLICATES. This can be achieved by using the 'DISTINCT' keyword after SELECT before CITY.