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diff --git a/org/apache/commons/net/pop3/POP3Command.java b/org/apache/commons/net/pop3/POP3Command.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+package org.apache.commons.net.pop3;
+
+/***
+ * POP3Command stores POP3 command code constants.
+ * <p>
+ * <p>
+ * @author Daniel F. Savarese
+ ***/
+
+public final class POP3Command
+{
+    /*** Send user name. ***/
+    public static final int USER = 0;
+    /*** Send password. ***/
+    public static final int PASS = 1;
+    /*** Quit session. ***/
+    public static final int QUIT = 2;
+    /*** Get status. ***/
+    public static final int STAT = 3;
+    /*** List message(s). ***/
+    public static final int LIST = 4;
+    /*** Retrieve message(s). ***/
+    public static final int RETR = 5;
+    /*** Delete message(s). ***/
+    public static final int DELE = 6;
+    /*** No operation.  Used as a session keepalive. ***/
+    public static final int NOOP = 7;
+    /*** Reset session. ***/
+    public static final int RSET = 8;
+    /*** Authorization. ***/
+    public static final int APOP = 9;
+    /*** Retrieve top number lines from message. ***/
+    public static final int TOP = 10;
+    /*** List unique message identifier(s). ***/
+    public static final int UIDL = 11;
+
+    static final String[] _commands = {
+                                          "USER", "PASS", "QUIT", "STAT", "LIST", "RETR", "DELE", "NOOP", "RSET",
+                                          "APOP", "TOP", "UIDL"
+                                      };
+
+    // Cannot be instantiated.
+    private POP3Command()
+    {}
+
+    /***
+     * Get the POP3 protocol string command corresponding to a command code.
+     * <p>
+     * @return The POP3 protocol string command corresponding to a command code.
+     ***/
+    public static final String getCommand(int command)
+    {
+        return _commands[command];
+    }
+}