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diff --git a/region_code.h b/region_code.h
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+// Copyright (C) 2011 The Libphonenumber Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef I18N_PHONENUMBERS_REGION_CODE_H_
+#define I18N_PHONENUMBERS_REGION_CODE_H_
+
+#include <string>
+
+namespace i18n {
+namespace phonenumbers {
+
+using std::string;
+
+class RegionCode {
+ public:
+  // Returns a region code string representing the "unknown" region.
+  static const char* GetUnknown() {
+    return ZZ();
+  }
+
+  static const char* ZZ() {
+    return "ZZ";
+  }
+};
+
+}  // namespace phonenumbers
+}  // namespace i18n
+
+#endif  // I18N_PHONENUMBERS_REGION_CODE_H_