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diff --git a/theories/Sorting/Permutation.v b/theories/Sorting/Permutation.v
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@@ -16,6 +16,7 @@
Require Import List Setoid Compare_dec Morphisms FinFun.
Import ListNotations. (* For notations [] and [a;b;c] *)
Set Implicit Arguments.
+Set Universe Polymorphism.
Section Permutation.