(third-person singular simple present falls back upon, present participle falling back upon, simple past and past participle fell back upon)
"fall-back-upon." YourDictionary, n.d. Web. 19 September 2018. <http://www.yourdictionary.com/fall-back-upon>.
fall-back-upon. (n.d.). Retrieved September 19th, 2018, from http://www.yourdictionary.com/fall-back-upon
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