This is pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009/Debian) (format=pdflatex 2011.8.25)  25 AUG 2011 13:44
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**calegari-stein-tor.tex
(./calegari-stein-tor.tex
LaTeX2e <2009/09/24>
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! LaTeX Error: File `xy.sty' not found.

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!  ==> Fatal error occurred, no output PDF file produced!