Lemma B.2 (Covering trick) . [01HX]
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Lemma B.2 (Covering trick).
Assume that is algebraically closed. Let be an SNC -variety and denote by the set of irreducible components of . Let also and . Then there exists an SNC -scheme and a finite surjective morphism such that is divisible by in and is smooth over (but possibly disconnected) for all .