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diff --git a/examples/cxx/serializer/polymorphism/supermen-simpl-mixin.hxx b/examples/cxx/serializer/polymorphism/supermen-simpl-mixin.hxx
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+++ b/examples/cxx/serializer/polymorphism/supermen-simpl-mixin.hxx
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+// file      : examples/cxx/serializer/polymorphism/library-simpl-mixin.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef SUPERMEN_SIMPL_HXX
+#define SUPERMEN_SIMPL_HXX
+
+#include "supermen.hxx"
+#include "supermen-sskel.hxx"
+
+struct person_simpl: virtual person_sskel
+{
+  virtual void
+  pre (const person&);
+
+  virtual std::string
+  name ();
+
+protected:
+  const person* person_;
+};
+
+struct superman_simpl: virtual superman_sskel, person_simpl
+{
+  virtual bool
+  can_fly ();
+};
+
+struct batman_simpl: virtual batman_sskel, superman_simpl
+{
+  virtual unsigned int
+  wing_span ();
+};
+
+struct supermen_simpl: virtual supermen_sskel
+{
+  virtual void
+  pre (const supermen&);
+
+  virtual bool
+  person_next ();
+
+  virtual const ::person&
+  person ();
+
+private:
+  const supermen* supermen_;
+  supermen::const_iterator i_;
+};
+
+#endif // SUPERMEN_SIMPL_HXX