$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
4.89
\begin{equation} \begin{gathered}\label{equation:pushout-of-categorically-connective} \xymatrix@C =50pt@R=50pt{ A \ar [d]^{f} \ar [r] & A' \ar [d]^{f'} \\ B \ar [r] & B', } \end{gathered} \end{equation}