deletions | additions       diff --git a/untitled.tex b/untitled.tex  index 38fc91a..7a1a7b5 100644  --- a/untitled.tex  +++ b/untitled.tex 
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Rules:  \begin{equation}  +-=# +-=|  \\ #+=- |+=-  \\ #-=+ |-=+  \\ \\  ++=+ \\  --=- \\  ##=# ||=|  \end{equation}