Hi, all I was looking for something else, but when this popped up I had to share it. Some of you likely read this at the time it came out in 2003, but I did not. https://www.sciencenews.org/article/contra-dances-matrices-and-groups As not a mathematician, I chuckled as I scanned it – hope you do as well. Those of you who ARE mathematicians will get more of the nuances. Dorcas Hand Houston TX
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