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https://dept.math.lsa.umich.edu/~speyer/632Old/mar-31.tex
https://dept.math.lsa.umich.edu/~speyer/632Old/apr-5.tex
https://dept.math.lsa.umich.edu/~speyer/632Old/apr-7.tex
https://dept.math.lsa.umich.edu/~speyer/632Old/apr-12.tex
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https://dept.math.lsa.umich.edu/~speyer/632Old/632.html
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