\begin{equation} \label{stacks-more-morphisms-equation-object} \vcenter { \xymatrix{ U \ar[d]_ a \ar[r]_ i & U' \ar[dd]^{x'} \\ W \ar[d]_ x & \\ \mathcal{X} \ar[r] & \mathcal{X}' } } \end{equation}
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