Attributed to John Horton Conway. From unless, by analogy with the formation of iff, from if.
"unlesss." YourDictionary, n.d. Web. 13 April 2019. <https://www.yourdictionary.com/unlesss>.
unlesss. (n.d.). Retrieved April 13th, 2019, from https://www.yourdictionary.com/unlesss
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