$$\begin{array}{|c|}\hline \phantom{\text{fail}}\mathrm{H}\phantom{\text{fail}}\\ \mathrm{T}\\ \mathrm{U}\\ \hline\end{array}=\begin{array}{|c|}\hline \mathrm{H}\\ \mathrm{T}\\ \phantom{\text{fail}}\mathrm{U}\phantom{\text{fail}}\\ \hline\end{array}$$