deletions | additions       diff --git a/Project.tex b/Project.tex  index a5c9697..86843f6 100644  --- a/Project.tex  +++ b/Project.tex 
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\begin{bmatrix}  ac \\ ad \\ bc \\ bd  \end{bmatrix}  or  \begin{bmatrix}  ac \\ bc \\ ad \\ bd  \end{bmatrix}  \end{equation}