X signifies an arbitrary lexical category; certain structures are represented by this letter and an overbar.
"x-bar-theory." YourDictionary, n.d. Web. 14 December 2018. <https://www.yourdictionary.com/x-bar-theory>.
x-bar-theory. (n.d.). Retrieved December 14th, 2018, from https://www.yourdictionary.com/x-bar-theory
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