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    The Twelve Days of Christmas (A Mathematical Solution)
    2:48

    The Twelve Days of Christmas (A Mathematical Solution)

    Editor Libre Office (OS: Ubuntu) Music http://www.freexmasmp3.com/ Lyrics https://en.wikipedia.org/wiki/The_Twelve_Days_of_Christmas_(song) Graphics Pinta Image Editor (OS: Ubuntu) Video OpenShot Video Editor (OS: Ubuntu) Lemma 1 https://en.wikipedia.org/wiki/Triangular_number Lemma 2 https://en.wikipedia.org/wiki/Square_pyramidal_number
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