$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
9.14
\begin{equation} \begin{gathered}\label{equation:lifting-problem-via-double-slice} \xymatrix@R =50pt@C=50pt{ A \ar [d] \ar [r] & X \ar [d] \\ B \ar [r] \ar@ {-->}[ur] & Y } \end{gathered} \end{equation}