# Kerodon

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Remark 8.4.0.41 (Two-out-of-Six). Let $F: \operatorname{\mathcal{A}}\rightarrow \operatorname{\mathcal{B}}$, $G: \operatorname{\mathcal{B}}\rightarrow \operatorname{\mathcal{C}}$, and $H: \operatorname{\mathcal{C}}\rightarrow \operatorname{\mathcal{D}}$ be functors between $\infty$-categories. If $G \circ F$ and $H \circ G$ are equivalences of $\infty$-categories, then $F$, $G$, and $H$ are equivalences of $\infty$-categories.