Cacher is the code snippet organizer for pro developers

\begin{tikzcd}
A  \arrow[d, "d" ] \arrow{r}[near start]{\phi}[swap]{\psi} &B \arrow[d] \\
E  \arrow[r] &D \\
R  \arrow [u, "\alpha"] \arrow[r]  &T \arrow[u]
\end{tikzcd}