English ordinal numbers may function as either an adjective or as a noun, and almost never appear in the plural.
"thirty-first." YourDictionary, n.d. Web. 12 November 2018. <https://www.yourdictionary.com/thirty-first>.
thirty-first. (n.d.). Retrieved November 12th, 2018, from https://www.yourdictionary.com/thirty-first
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