(comparative more rollercoastering, superlative most rollercoastering)
rollercoaster + -ing
"rollercoastering." YourDictionary, n.d. Web. 09 April 2019. <https://www.yourdictionary.com/rollercoastering>.
rollercoastering. (n.d.). Retrieved April 09th, 2019, from https://www.yourdictionary.com/rollercoastering
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