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diff --git a/isar/Example-Xsym.thy b/isar/Example-Xsym.thy
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--- a/isar/Example-Xsym.thy
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@@ -4,7 +4,7 @@
$Id$
*)
-theory Example = Main:
+theory Example imports Main begin
text {* Proper proof text -- \textit{naive version}. *}