The question of “a” vs “an” is always decided by the pronunciation of the word that follows the article. Thus, various geographical regions that have different pronunciation rules may use a different article for the same word.
Words that begin with a vowel sound, such as “apple”, “egg”, or “hour” are preceded by “an”.
All other words, such as “cake”, “pie”, and “user” (which begins with a
y sound), are preceded by “a”.
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