English ordinal numbers may function as either an adjective or as a noun, and almost never appear in the plural.
"eighty-first." YourDictionary, n.d. Web. 21 January 2019. <https://www.yourdictionary.com/eighty-first>.
eighty-first. (n.d.). Retrieved January 21st, 2019, from https://www.yourdictionary.com/eighty-first
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