Math talk with constraint on words (e.g. only use 6-letters words)

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I am trying to find a math talk on YouTube, which I had seen a while ago. The only thing I remember is that it was an entertaining talk (like a fun challenge) where the speaker had a specific constraint on the words he could use. If I remember corrected, he was only allowed to use 6-letters words. So for instance, he replace "Proof : ..." by "Solved : ...", or "Theorem" by "Result", etc. Did anyone watch this video as well, by chance? I would be glad to find the reference... Thanks!