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-rw-r--r--theories/Classes/RelationClasses.v2
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diff --git a/theories/Classes/RelationClasses.v b/theories/Classes/RelationClasses.v
index 0d61302636..cc3cae4dab 100644
--- a/theories/Classes/RelationClasses.v
+++ b/theories/Classes/RelationClasses.v
@@ -74,6 +74,8 @@ Hint Extern 4 => solve_relation : relations.
(** We can already dualize all these properties. *)
+Generalizable Variables A B C D R S T U eqA eqB eqC eqD.
+
Program Lemma flip_Reflexive `(Reflexive A R) : Reflexive (flip R).
Proof. tauto. Qed.