Lemma 8.6.6. Let $\mathcal{C}$ be a site. The $2$-category of stacks in setoids over $\mathcal{C}$ has 2-fibre products, and they are described as in Categories, Lemma 4.32.3.

**Proof.**
This is clear from Categories, Lemmas 4.35.7 and 4.39.4 and Lemmas 8.5.2 and 8.4.6.
$\square$

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