Indefinite Article.
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1. Is article indefinite.
1.1. Implies that the thing referred to is nonspecific.
2. Article
2.1. "a"
2.2. "an"
3. Article "a" "an"
3.1. It is analogous to items ""and"" one.
3.2. Example: a flower, a boy: a orange, a mother .
4. Examples.
4.1. Video.
4.2. it´s a book.
4.3. a computer.
