\documentclass{tables}

\begin{document}

\sect{Planes}

\begin{tabular}[C]{c} \hlx*{hv}
  \tt{Elemental dominance} \\ \hlx{vhv}
  \begin{graph}
    !{<0.8in, 0in>:}
    *+{Air} ="a"
    [rd] *+{Water} ="w"
    [dl] *+{Fire} ="f"
    [ul] *+{Earth} ="e"
    !{"a"; "w" !U*d@{>} \ellipse r,_,d{-}}
    !{"w"; "f" !R*l@{>} \ellipse d,_,l{-}}
    !{"f"; "e" !D*u@{>} \ellipse l,_,u{-}}
    !{"e"; "a" !L*r@{>} \ellipse u,_,r{-}}
    "a" :@{<->} "f"
    "e" :@{<->} "w"
  \end{graph}
  \\ \hlx*{vh}
\end{tabular}

\end{document}

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