
\begin{tabular}{cccc}
\toprule
& $x<1$ & $x=1$ &\hspace{-35pt} $x>1$\\
\midrule
\\
$y>1$ \hspace{-25pt}\mbox{}&
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\hspace{-61pt}\mbox{}&
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\hspace{-35pt}\mbox{}&
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\\
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\hspace{-61pt}\mbox{}&
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\hspace{-35pt}\mbox{}&
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\hspace{-61pt}\mbox{}&
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% front edges
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\hspace{-35pt}\mbox{}&
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% z axis
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\end{picture}
\end{array}$
\\[-20pt]
\bottomrule
\end{tabular}
