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diff --git a/src/Common/Tactics.v b/src/Common/Tactics.v
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+++ b/src/Common/Tactics.v
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+Module Tactics.
+
+  Ltac unfold_rec c := unfold c; fold c.
+
+  Ltac solve_by_inverts n :=
+    match goal with | H : ?T |- _ =>
+      match type of T with Prop =>
+        inversion H;
+        match n with S (S (?n')) => subst; try constructor; solve_by_inverts (S n') end
+      end
+    end.
+
+  Ltac solve_by_invert := solve_by_inverts 1.
+  
+End Tactics.
+Export Tactics.