$$
\Dg
u           & \rTo ^{e_1}   & v       & & \rTo \up{3pt} ^f \rTo \up{-3pt} _g & d    \\
\uDashto >s &               & \dTo >e &                   &                  & \uTo \\
w           & \rTo ^{ee_1s} & w       & {} = {\mit\Pi}k_i & \rTo             & k_i  \\
\endDg
$$