This is pdfTeX, Version 3.14159265-2.6-1.40.15 (TeX Live 2014) (preloaded format=pdflatex 2017.9.15) 20 APR 2018 15:34 entering extended mode restricted \write18 enabled. %&-line parsing enabled. **semaphore.tex (./semaphore.tex LaTeX2e <2011/06/27> Babel <3.9k> and hyphenation patterns for 78 languages loaded. 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