English ordinal numbers may function as either an adjective or as a noun, and almost never appear in the plural.
"ninety-ninth." YourDictionary, n.d. Web. 16 October 2018. <http://www.yourdictionary.com/ninety-ninth>.
ninety-ninth. (n.d.). Retrieved October 16th, 2018, from http://www.yourdictionary.com/ninety-ninth
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