The document discusses the usage of articles (a, an, the) in the English language. It explains that articles are used before singular countable nouns and that the determination of whether to use "a" or "an" depends on whether the next word begins with a vowel or consonant sound. It also discusses some exceptions where articles are used before uncountable nouns or proper nouns. The key information provided is about the rules for using indefinite and definite articles in the English language.
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