deletions | additions       diff --git a/p4.tex b/p4.tex  index 6d0f760..d83763e 100644  --- a/p4.tex  +++ b/p4.tex 
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...  $2^900 $2^{900}  = 1 mod 7$ $2^901 $2^{901}  = 2 mod 7$ $2^902 \bf$2^{902}  = 4 mod 7$ \end{itemize}