$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
7.4
\begin{equation} \begin{gathered}\label{equation:relative-colimit-pointwise-existence-strong} \xymatrix@R =50pt@C=50pt{ (B \times K) {\coprod }_{ (A \times K ) } (A \times K^{\triangleright }) \ar [r]^-{ f } \ar [d] & \operatorname{\mathcal{C}}\ar [d]^{U} \\ B \times K^{\triangleright } \ar [r] \ar@ {-->}[ur]^{ \overline{f} } & \operatorname{\mathcal{D}}} \end{gathered} \end{equation}