deletions | additions       diff --git a/Block Ciphers.tex b/Block Ciphers.tex  index d3f1bec..f772ade 100644  --- a/Block Ciphers.tex  +++ b/Block Ciphers.tex 
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\item Permutations from $\sum^n \rightarrow \sum^n$?  \begin{itemize}  \item $2^n!$  \item Sterling's Approximation: $x! = \sqrt{2\pi x};,(\frac{x}{e})^x x}\,(\frac{x}{e})^x  $ \end{itemize}  \end{itemize}  \end{itemize}