This is pdfTeX, Version 3.14159265-2.6-1.40.15 (TeX Live 2015/dev/Debian) (preloaded format=pdflatex 2015.4.24)  17 JUL 2015 16:13
entering extended mode
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**main.tex

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Here is how much of TeX's memory you used:
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 3329 multiletter control sequences out of 15000+600000
 3640 words of font info for 14 fonts, out of 8000000 for 9000
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!  ==> Fatal error occurred, no output PDF file produced!