Kerodon

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4.39
\begin{equation} \begin{gathered}\label{equation:typical-lifting-problem} \xymatrix@R =50pt@C=50pt{ A \ar [r]^-{f_0} \ar [d]^{i} & X \ar [d]^{q} \\ B \ar [r]^-{ \overline{f} } \ar@ {-->}[ur] & S, } \end{gathered} \end{equation}