<<< mml $$\begin{array}{|c|}\hline \mathrm{H}\\ \mathrm{T}\\ \mathrm{U}\\ \hline\end{array}=\begin{array}{|c|}\hline \mathrm{H}\\ \mathrm{T}\\ \mathrm{U}\\ \hline\end{array}$$ >>> native [ EArray [ AlignCenter ] [ [ [ EIdentifier "H" ] ] , [ [ EIdentifier "T" ] ] , [ [ EIdentifier "U" ] ] ] , ESymbol Rel "=" , EArray [ AlignCenter ] [ [ [ EIdentifier "H" ] ] , [ [ EIdentifier "T" ] ] , [ [ EIdentifier "U" ] ] ] ]