\begin{array}{ll}
 & \text{27F} \\
\text{0} & \\
\text{1} & \\
\text{2} & \\
\text{3} & \\
\text{4} & \\
\text{5} & \longleftarrow \\
\text{6} & \longrightarrow \\
\text{7} & \longleftrightarrow \\
\text{8} & \Longleftarrow \\
\text{9} & \Longrightarrow \\
\text{A} & \Longleftrightarrow \\
\text{B} & \\
\text{C} & \longmapsto \\
\text{D} & \\
\text{E} & \\
\text{F} & \\
\end{array}
