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Pinyin/A
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
See also
Pinyin#Pinyin tone marking
Article
a: used before countable or singular nouns referring to people or things that have not already been mentioned
1'g: yohngyur keeshuu huoh danshuh mirngcir zhiqiarn, zhii dih-1-cih tirdaoh d rern huoh shihwuh.