(third-person singular simple present racks one's brains, present participle racking one's brains, simple past and past participle racked one's brains)
"rack-one-s-brains." YourDictionary, n.d. Web. 20 January 2019. <https://www.yourdictionary.com/rack-one-s-brains>.
rack-one-s-brains. (n.d.). Retrieved January 20th, 2019, from https://www.yourdictionary.com/rack-one-s-brains
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