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**SandBoxRelativeVelocity.tex
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(./SandBoxRelativeVelocity.aux)
! I can't write on file `SandBoxRelativeVelocity.aux'.
\document ...ate \openout \@mainaux \jobname .aux 
                                                  \immediate \write \@mainau...
l.51 \begin{document}
                     
(Press Enter to retry, or Control-D to exit; default file extension is `.tex')
Please type another output file name
! Emergency stop.
\document ...ate \openout \@mainaux \jobname .aux 
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l.51 \begin{document}
                     
*** (job aborted, file error in nonstop mode)

 
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No pages of output.