Does statement "It can be only one." mean that in the list only one string is most frequent? Case ['a', 'a', 'b', 'b', 'c', 'c'] - is impossible? Or it mean than function should return only one string, even if there are a few strings with same frequence?
The Most Frequent
SEARCHING TIPS
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author:[username] - Returns posts by user
associated with the given user.
tag:[tag_name1],[tag_name2], ... - Returns
posts associated with the given tag(s).
phrase - Returns posts that contain the word
or set of words in title or text.
