User:Artemisfowl3rd

Test:

\begin{tikzcd} A & B \\ C & D \arrow[""{name=0, anchor=center, inner sep=0}, "f"', from=1-1, to=2-1] \arrow[""{name=1, anchor=center, inner sep=0}, "g", from=1-2, to=2-2] \arrow["e", shorten <=6pt, shorten >=6pt, from=0, to=1] \end{tikzcd}