• For each morphism $f\colon A\to B$ of $\mathcal{D}$, we have a diagram
    in $\mathcal{D}$ satisfying the following conditions:
    1. We have $f=\alpha _{0}\circ \phi _{1}$.
    2. We have $f=\psi _{m}\circ \alpha _{2m}$.
    3. For each $0\leq i\leq 2m$, we have $\alpha _{i}\in \textup{Mor}\webleft (\mathrm{Im}\webleft (F\webright )\webright )$.

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