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diff --git a/third_party/protobuf/3.4.0/csharp/src/AddressBook/Program.cs b/third_party/protobuf/3.4.0/csharp/src/AddressBook/Program.cs
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+++ b/third_party/protobuf/3.4.0/csharp/src/AddressBook/Program.cs
@@ -0,0 +1,95 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+
+namespace Google.Protobuf.Examples.AddressBook
+{
+    /// <summary>
+    /// Entry point. Repeatedly prompts user for an action to take, delegating actual behaviour
+    /// to individual actions. Each action has its own Main method, so that it can be used as an
+    /// invidual complete program.
+    /// </summary>
+    internal class Program
+    {
+        private static int Main(string[] args)
+        {
+            if (args.Length > 1)
+            {
+                Console.Error.WriteLine("Usage: AddressBook [file]");
+                Console.Error.WriteLine("If the filename isn't specified, \"addressbook.data\" is used instead.");
+                return 1;
+            }
+            string addressBookFile = args.Length > 0 ? args[0] : "addressbook.data";
+
+            bool stopping = false;
+            while (!stopping)
+            {
+                Console.WriteLine("Options:");
+                Console.WriteLine("  L: List contents");
+                Console.WriteLine("  A: Add new person");
+                Console.WriteLine("  Q: Quit");
+                Console.Write("Action? ");
+                Console.Out.Flush();
+                char choice = Console.ReadKey().KeyChar;
+                Console.WriteLine();
+                try
+                {
+                    switch (choice)
+                    {
+                        case 'A':
+                        case 'a':
+                            AddPerson.Main(new string[] {addressBookFile});
+                            break;
+                        case 'L':
+                        case 'l':
+                            ListPeople.Main(new string[] {addressBookFile});
+                            break;
+                        case 'Q':
+                        case 'q':
+                            stopping = true;
+                            break;
+                        default:
+                            Console.WriteLine("Unknown option: {0}", choice);
+                            break;
+                    }
+                }
+                catch (Exception e)
+                {
+                    Console.WriteLine("Exception executing action: {0}", e);
+                }
+                Console.WriteLine();
+            }
+            return 0;
+        }
+    }
+}
+\ No newline at end of file