Remark 4.30.3. Thus there are variants of the construction of Example 4.30.2 above where we look at the $2$-category of groupoids, or categories fibred in groupoids over a fixed category, or stacks. And so on.
Remark 4.30.3. Thus there are variants of the construction of Example 4.30.2 above where we look at the $2$-category of groupoids, or categories fibred in groupoids over a fixed category, or stacks. And so on.
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