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<FONT color="green">001</FONT>    /**<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<FONT color="green">003</FONT>     * or more contributor license agreements.  See the NOTICE file<a name="line.3"></a>
<FONT color="green">004</FONT>     * distributed with this work for additional information<a name="line.4"></a>
<FONT color="green">005</FONT>     * regarding copyright ownership.  The ASF licenses this file<a name="line.5"></a>
<FONT color="green">006</FONT>     * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<FONT color="green">007</FONT>     * "License"); you may not use this file except in compliance<a name="line.7"></a>
<FONT color="green">008</FONT>     * with the License.  You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT>     *<a name="line.11"></a>
<FONT color="green">012</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<FONT color="green">013</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<FONT color="green">014</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<FONT color="green">015</FONT>     * See the License for the specific language governing permissions and<a name="line.15"></a>
<FONT color="green">016</FONT>     * limitations under the License.<a name="line.16"></a>
<FONT color="green">017</FONT>     */<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    package org.apache.hadoop.mapred.lib;<a name="line.19"></a>
<FONT color="green">020</FONT>    <a name="line.20"></a>
<FONT color="green">021</FONT>    import org.apache.hadoop.util.ReflectionUtils;<a name="line.21"></a>
<FONT color="green">022</FONT>    import org.apache.hadoop.classification.InterfaceAudience;<a name="line.22"></a>
<FONT color="green">023</FONT>    import org.apache.hadoop.classification.InterfaceStability;<a name="line.23"></a>
<FONT color="green">024</FONT>    import org.apache.hadoop.mapred.MapRunnable;<a name="line.24"></a>
<FONT color="green">025</FONT>    import org.apache.hadoop.mapred.JobConf;<a name="line.25"></a>
<FONT color="green">026</FONT>    import org.apache.hadoop.mapred.Mapper;<a name="line.26"></a>
<FONT color="green">027</FONT>    import org.apache.hadoop.mapred.RecordReader;<a name="line.27"></a>
<FONT color="green">028</FONT>    import org.apache.hadoop.mapred.OutputCollector;<a name="line.28"></a>
<FONT color="green">029</FONT>    import org.apache.hadoop.mapred.Reporter;<a name="line.29"></a>
<FONT color="green">030</FONT>    import org.apache.hadoop.mapred.SkipBadRecords;<a name="line.30"></a>
<FONT color="green">031</FONT>    import org.apache.hadoop.mapreduce.lib.map.MultithreadedMapper;<a name="line.31"></a>
<FONT color="green">032</FONT>    import org.apache.commons.logging.Log;<a name="line.32"></a>
<FONT color="green">033</FONT>    import org.apache.commons.logging.LogFactory;<a name="line.33"></a>
<FONT color="green">034</FONT>    <a name="line.34"></a>
<FONT color="green">035</FONT>    import java.io.IOException;<a name="line.35"></a>
<FONT color="green">036</FONT>    import java.util.concurrent.*;<a name="line.36"></a>
<FONT color="green">037</FONT>    <a name="line.37"></a>
<FONT color="green">038</FONT>    /**<a name="line.38"></a>
<FONT color="green">039</FONT>     * Multithreaded implementation for @link org.apache.hadoop.mapred.MapRunnable.<a name="line.39"></a>
<FONT color="green">040</FONT>     * &lt;p&gt;<a name="line.40"></a>
<FONT color="green">041</FONT>     * It can be used instead of the default implementation,<a name="line.41"></a>
<FONT color="green">042</FONT>     * @link org.apache.hadoop.mapred.MapRunner, when the Map operation is not CPU<a name="line.42"></a>
<FONT color="green">043</FONT>     * bound in order to improve throughput.<a name="line.43"></a>
<FONT color="green">044</FONT>     * &lt;p&gt;<a name="line.44"></a>
<FONT color="green">045</FONT>     * Map implementations using this MapRunnable must be thread-safe.<a name="line.45"></a>
<FONT color="green">046</FONT>     * &lt;p&gt;<a name="line.46"></a>
<FONT color="green">047</FONT>     * The Map-Reduce job has to be configured to use this MapRunnable class (using<a name="line.47"></a>
<FONT color="green">048</FONT>     * the JobConf.setMapRunnerClass method) and<a name="line.48"></a>
<FONT color="green">049</FONT>     * the number of thread the thread-pool can use with the<a name="line.49"></a>
<FONT color="green">050</FONT>     * &lt;code&gt;mapred.map.multithreadedrunner.threads&lt;/code&gt; property, its default<a name="line.50"></a>
<FONT color="green">051</FONT>     * value is 10 threads.<a name="line.51"></a>
<FONT color="green">052</FONT>     * &lt;p&gt;<a name="line.52"></a>
<FONT color="green">053</FONT>     */<a name="line.53"></a>
<FONT color="green">054</FONT>    @InterfaceAudience.Public<a name="line.54"></a>
<FONT color="green">055</FONT>    @InterfaceStability.Stable<a name="line.55"></a>
<FONT color="green">056</FONT>    public class MultithreadedMapRunner&lt;K1, V1, K2, V2&gt;<a name="line.56"></a>
<FONT color="green">057</FONT>        implements MapRunnable&lt;K1, V1, K2, V2&gt; {<a name="line.57"></a>
<FONT color="green">058</FONT>    <a name="line.58"></a>
<FONT color="green">059</FONT>      private static final Log LOG =<a name="line.59"></a>
<FONT color="green">060</FONT>        LogFactory.getLog(MultithreadedMapRunner.class.getName());<a name="line.60"></a>
<FONT color="green">061</FONT>    <a name="line.61"></a>
<FONT color="green">062</FONT>      private JobConf job;<a name="line.62"></a>
<FONT color="green">063</FONT>      private Mapper&lt;K1, V1, K2, V2&gt; mapper;<a name="line.63"></a>
<FONT color="green">064</FONT>      private ExecutorService executorService;<a name="line.64"></a>
<FONT color="green">065</FONT>      private volatile IOException ioException;<a name="line.65"></a>
<FONT color="green">066</FONT>      private volatile RuntimeException runtimeException;<a name="line.66"></a>
<FONT color="green">067</FONT>      private boolean incrProcCount;<a name="line.67"></a>
<FONT color="green">068</FONT>    <a name="line.68"></a>
<FONT color="green">069</FONT>      @SuppressWarnings("unchecked")<a name="line.69"></a>
<FONT color="green">070</FONT>      public void configure(JobConf jobConf) {<a name="line.70"></a>
<FONT color="green">071</FONT>        int numberOfThreads =<a name="line.71"></a>
<FONT color="green">072</FONT>          jobConf.getInt(MultithreadedMapper.NUM_THREADS, 10);<a name="line.72"></a>
<FONT color="green">073</FONT>        if (LOG.isDebugEnabled()) {<a name="line.73"></a>
<FONT color="green">074</FONT>          LOG.debug("Configuring jobConf " + jobConf.getJobName() +<a name="line.74"></a>
<FONT color="green">075</FONT>                    " to use " + numberOfThreads + " threads");<a name="line.75"></a>
<FONT color="green">076</FONT>        }<a name="line.76"></a>
<FONT color="green">077</FONT>    <a name="line.77"></a>
<FONT color="green">078</FONT>        this.job = jobConf;<a name="line.78"></a>
<FONT color="green">079</FONT>        //increment processed counter only if skipping feature is enabled<a name="line.79"></a>
<FONT color="green">080</FONT>        this.incrProcCount = SkipBadRecords.getMapperMaxSkipRecords(job)&gt;0 &amp;&amp; <a name="line.80"></a>
<FONT color="green">081</FONT>          SkipBadRecords.getAutoIncrMapperProcCount(job);<a name="line.81"></a>
<FONT color="green">082</FONT>        this.mapper = ReflectionUtils.newInstance(jobConf.getMapperClass(),<a name="line.82"></a>
<FONT color="green">083</FONT>            jobConf);<a name="line.83"></a>
<FONT color="green">084</FONT>    <a name="line.84"></a>
<FONT color="green">085</FONT>        // Creating a threadpool of the configured size to execute the Mapper<a name="line.85"></a>
<FONT color="green">086</FONT>        // map method in parallel.<a name="line.86"></a>
<FONT color="green">087</FONT>        executorService = new ThreadPoolExecutor(numberOfThreads, numberOfThreads, <a name="line.87"></a>
<FONT color="green">088</FONT>                                                 0L, TimeUnit.MILLISECONDS,<a name="line.88"></a>
<FONT color="green">089</FONT>                                                 new BlockingArrayQueue<a name="line.89"></a>
<FONT color="green">090</FONT>                                                   (numberOfThreads));<a name="line.90"></a>
<FONT color="green">091</FONT>      }<a name="line.91"></a>
<FONT color="green">092</FONT>    <a name="line.92"></a>
<FONT color="green">093</FONT>      /**<a name="line.93"></a>
<FONT color="green">094</FONT>       * A blocking array queue that replaces offer and add, which throws on a full<a name="line.94"></a>
<FONT color="green">095</FONT>       * queue, to a put, which waits on a full queue.<a name="line.95"></a>
<FONT color="green">096</FONT>       */<a name="line.96"></a>
<FONT color="green">097</FONT>      private static class BlockingArrayQueue extends ArrayBlockingQueue&lt;Runnable&gt; {<a name="line.97"></a>
<FONT color="green">098</FONT>     <a name="line.98"></a>
<FONT color="green">099</FONT>        private static final long serialVersionUID = 1L;<a name="line.99"></a>
<FONT color="green">100</FONT>        public BlockingArrayQueue(int capacity) {<a name="line.100"></a>
<FONT color="green">101</FONT>          super(capacity);<a name="line.101"></a>
<FONT color="green">102</FONT>        }<a name="line.102"></a>
<FONT color="green">103</FONT>        public boolean offer(Runnable r) {<a name="line.103"></a>
<FONT color="green">104</FONT>          return add(r);<a name="line.104"></a>
<FONT color="green">105</FONT>        }<a name="line.105"></a>
<FONT color="green">106</FONT>        public boolean add(Runnable r) {<a name="line.106"></a>
<FONT color="green">107</FONT>          try {<a name="line.107"></a>
<FONT color="green">108</FONT>            put(r);<a name="line.108"></a>
<FONT color="green">109</FONT>          } catch (InterruptedException ie) {<a name="line.109"></a>
<FONT color="green">110</FONT>            Thread.currentThread().interrupt();<a name="line.110"></a>
<FONT color="green">111</FONT>          }<a name="line.111"></a>
<FONT color="green">112</FONT>          return true;<a name="line.112"></a>
<FONT color="green">113</FONT>        }<a name="line.113"></a>
<FONT color="green">114</FONT>      }<a name="line.114"></a>
<FONT color="green">115</FONT>    <a name="line.115"></a>
<FONT color="green">116</FONT>      private void checkForExceptionsFromProcessingThreads()<a name="line.116"></a>
<FONT color="green">117</FONT>          throws IOException, RuntimeException {<a name="line.117"></a>
<FONT color="green">118</FONT>        // Checking if a Mapper.map within a Runnable has generated an<a name="line.118"></a>
<FONT color="green">119</FONT>        // IOException. If so we rethrow it to force an abort of the Map<a name="line.119"></a>
<FONT color="green">120</FONT>        // operation thus keeping the semantics of the default<a name="line.120"></a>
<FONT color="green">121</FONT>        // implementation.<a name="line.121"></a>
<FONT color="green">122</FONT>        if (ioException != null) {<a name="line.122"></a>
<FONT color="green">123</FONT>          throw ioException;<a name="line.123"></a>
<FONT color="green">124</FONT>        }<a name="line.124"></a>
<FONT color="green">125</FONT>    <a name="line.125"></a>
<FONT color="green">126</FONT>        // Checking if a Mapper.map within a Runnable has generated a<a name="line.126"></a>
<FONT color="green">127</FONT>        // RuntimeException. If so we rethrow it to force an abort of the Map<a name="line.127"></a>
<FONT color="green">128</FONT>        // operation thus keeping the semantics of the default<a name="line.128"></a>
<FONT color="green">129</FONT>        // implementation.<a name="line.129"></a>
<FONT color="green">130</FONT>        if (runtimeException != null) {<a name="line.130"></a>
<FONT color="green">131</FONT>          throw runtimeException;<a name="line.131"></a>
<FONT color="green">132</FONT>        }<a name="line.132"></a>
<FONT color="green">133</FONT>      }<a name="line.133"></a>
<FONT color="green">134</FONT>    <a name="line.134"></a>
<FONT color="green">135</FONT>      public void run(RecordReader&lt;K1, V1&gt; input, OutputCollector&lt;K2, V2&gt; output,<a name="line.135"></a>
<FONT color="green">136</FONT>                      Reporter reporter)<a name="line.136"></a>
<FONT color="green">137</FONT>        throws IOException {<a name="line.137"></a>
<FONT color="green">138</FONT>        try {<a name="line.138"></a>
<FONT color="green">139</FONT>          // allocate key &amp; value instances these objects will not be reused<a name="line.139"></a>
<FONT color="green">140</FONT>          // because execution of Mapper.map is not serialized.<a name="line.140"></a>
<FONT color="green">141</FONT>          K1 key = input.createKey();<a name="line.141"></a>
<FONT color="green">142</FONT>          V1 value = input.createValue();<a name="line.142"></a>
<FONT color="green">143</FONT>    <a name="line.143"></a>
<FONT color="green">144</FONT>          while (input.next(key, value)) {<a name="line.144"></a>
<FONT color="green">145</FONT>    <a name="line.145"></a>
<FONT color="green">146</FONT>            executorService.execute(new MapperInvokeRunable(key, value, output,<a name="line.146"></a>
<FONT color="green">147</FONT>                                    reporter));<a name="line.147"></a>
<FONT color="green">148</FONT>    <a name="line.148"></a>
<FONT color="green">149</FONT>            checkForExceptionsFromProcessingThreads();<a name="line.149"></a>
<FONT color="green">150</FONT>    <a name="line.150"></a>
<FONT color="green">151</FONT>            // Allocate new key &amp; value instances as mapper is running in parallel<a name="line.151"></a>
<FONT color="green">152</FONT>            key = input.createKey();<a name="line.152"></a>
<FONT color="green">153</FONT>            value = input.createValue();<a name="line.153"></a>
<FONT color="green">154</FONT>          }<a name="line.154"></a>
<FONT color="green">155</FONT>    <a name="line.155"></a>
<FONT color="green">156</FONT>          if (LOG.isDebugEnabled()) {<a name="line.156"></a>
<FONT color="green">157</FONT>            LOG.debug("Finished dispatching all Mappper.map calls, job "<a name="line.157"></a>
<FONT color="green">158</FONT>                      + job.getJobName());<a name="line.158"></a>
<FONT color="green">159</FONT>          }<a name="line.159"></a>
<FONT color="green">160</FONT>    <a name="line.160"></a>
<FONT color="green">161</FONT>          // Graceful shutdown of the Threadpool, it will let all scheduled<a name="line.161"></a>
<FONT color="green">162</FONT>          // Runnables to end.<a name="line.162"></a>
<FONT color="green">163</FONT>          executorService.shutdown();<a name="line.163"></a>
<FONT color="green">164</FONT>    <a name="line.164"></a>
<FONT color="green">165</FONT>          try {<a name="line.165"></a>
<FONT color="green">166</FONT>    <a name="line.166"></a>
<FONT color="green">167</FONT>            // Now waiting for all Runnables to end.<a name="line.167"></a>
<FONT color="green">168</FONT>            while (!executorService.awaitTermination(100, TimeUnit.MILLISECONDS)) {<a name="line.168"></a>
<FONT color="green">169</FONT>              if (LOG.isDebugEnabled()) {<a name="line.169"></a>
<FONT color="green">170</FONT>                LOG.debug("Awaiting all running Mappper.map calls to finish, job "<a name="line.170"></a>
<FONT color="green">171</FONT>                          + job.getJobName());<a name="line.171"></a>
<FONT color="green">172</FONT>              }<a name="line.172"></a>
<FONT color="green">173</FONT>    <a name="line.173"></a>
<FONT color="green">174</FONT>              // NOTE: while Mapper.map dispatching has concluded there are still<a name="line.174"></a>
<FONT color="green">175</FONT>              // map calls in progress and exceptions would be thrown.<a name="line.175"></a>
<FONT color="green">176</FONT>              checkForExceptionsFromProcessingThreads();<a name="line.176"></a>
<FONT color="green">177</FONT>    <a name="line.177"></a>
<FONT color="green">178</FONT>            }<a name="line.178"></a>
<FONT color="green">179</FONT>    <a name="line.179"></a>
<FONT color="green">180</FONT>            // NOTE: it could be that a map call has had an exception after the<a name="line.180"></a>
<FONT color="green">181</FONT>            // call for awaitTermination() returing true. And edge case but it<a name="line.181"></a>
<FONT color="green">182</FONT>            // could happen.<a name="line.182"></a>
<FONT color="green">183</FONT>            checkForExceptionsFromProcessingThreads();<a name="line.183"></a>
<FONT color="green">184</FONT>    <a name="line.184"></a>
<FONT color="green">185</FONT>          } catch (IOException ioEx) {<a name="line.185"></a>
<FONT color="green">186</FONT>            // Forcing a shutdown of all thread of the threadpool and rethrowing<a name="line.186"></a>
<FONT color="green">187</FONT>            // the IOException<a name="line.187"></a>
<FONT color="green">188</FONT>            executorService.shutdownNow();<a name="line.188"></a>
<FONT color="green">189</FONT>            throw ioEx;<a name="line.189"></a>
<FONT color="green">190</FONT>          } catch (InterruptedException iEx) {<a name="line.190"></a>
<FONT color="green">191</FONT>            throw new RuntimeException(iEx);<a name="line.191"></a>
<FONT color="green">192</FONT>          }<a name="line.192"></a>
<FONT color="green">193</FONT>    <a name="line.193"></a>
<FONT color="green">194</FONT>        } finally {<a name="line.194"></a>
<FONT color="green">195</FONT>          mapper.close();<a name="line.195"></a>
<FONT color="green">196</FONT>        }<a name="line.196"></a>
<FONT color="green">197</FONT>      }<a name="line.197"></a>
<FONT color="green">198</FONT>    <a name="line.198"></a>
<FONT color="green">199</FONT>    <a name="line.199"></a>
<FONT color="green">200</FONT>      /**<a name="line.200"></a>
<FONT color="green">201</FONT>       * Runnable to execute a single Mapper.map call from a forked thread.<a name="line.201"></a>
<FONT color="green">202</FONT>       */<a name="line.202"></a>
<FONT color="green">203</FONT>      private class MapperInvokeRunable implements Runnable {<a name="line.203"></a>
<FONT color="green">204</FONT>        private K1 key;<a name="line.204"></a>
<FONT color="green">205</FONT>        private V1 value;<a name="line.205"></a>
<FONT color="green">206</FONT>        private OutputCollector&lt;K2, V2&gt; output;<a name="line.206"></a>
<FONT color="green">207</FONT>        private Reporter reporter;<a name="line.207"></a>
<FONT color="green">208</FONT>    <a name="line.208"></a>
<FONT color="green">209</FONT>        /**<a name="line.209"></a>
<FONT color="green">210</FONT>         * Collecting all required parameters to execute a Mapper.map call.<a name="line.210"></a>
<FONT color="green">211</FONT>         * &lt;p&gt;<a name="line.211"></a>
<FONT color="green">212</FONT>         *<a name="line.212"></a>
<FONT color="green">213</FONT>         * @param key<a name="line.213"></a>
<FONT color="green">214</FONT>         * @param value<a name="line.214"></a>
<FONT color="green">215</FONT>         * @param output<a name="line.215"></a>
<FONT color="green">216</FONT>         * @param reporter<a name="line.216"></a>
<FONT color="green">217</FONT>         */<a name="line.217"></a>
<FONT color="green">218</FONT>        public MapperInvokeRunable(K1 key, V1 value,<a name="line.218"></a>
<FONT color="green">219</FONT>                                   OutputCollector&lt;K2, V2&gt; output,<a name="line.219"></a>
<FONT color="green">220</FONT>                                   Reporter reporter) {<a name="line.220"></a>
<FONT color="green">221</FONT>          this.key = key;<a name="line.221"></a>
<FONT color="green">222</FONT>          this.value = value;<a name="line.222"></a>
<FONT color="green">223</FONT>          this.output = output;<a name="line.223"></a>
<FONT color="green">224</FONT>          this.reporter = reporter;<a name="line.224"></a>
<FONT color="green">225</FONT>        }<a name="line.225"></a>
<FONT color="green">226</FONT>    <a name="line.226"></a>
<FONT color="green">227</FONT>        /**<a name="line.227"></a>
<FONT color="green">228</FONT>         * Executes a Mapper.map call with the given Mapper and parameters.<a name="line.228"></a>
<FONT color="green">229</FONT>         * &lt;p&gt;<a name="line.229"></a>
<FONT color="green">230</FONT>         * This method is called from the thread-pool thread.<a name="line.230"></a>
<FONT color="green">231</FONT>         *<a name="line.231"></a>
<FONT color="green">232</FONT>         */<a name="line.232"></a>
<FONT color="green">233</FONT>        public void run() {<a name="line.233"></a>
<FONT color="green">234</FONT>          try {<a name="line.234"></a>
<FONT color="green">235</FONT>            // map pair to output<a name="line.235"></a>
<FONT color="green">236</FONT>            MultithreadedMapRunner.this.mapper.map(key, value, output, reporter);<a name="line.236"></a>
<FONT color="green">237</FONT>            if(incrProcCount) {<a name="line.237"></a>
<FONT color="green">238</FONT>              reporter.incrCounter(SkipBadRecords.COUNTER_GROUP, <a name="line.238"></a>
<FONT color="green">239</FONT>                  SkipBadRecords.COUNTER_MAP_PROCESSED_RECORDS, 1);<a name="line.239"></a>
<FONT color="green">240</FONT>            }<a name="line.240"></a>
<FONT color="green">241</FONT>          } catch (IOException ex) {<a name="line.241"></a>
<FONT color="green">242</FONT>            // If there is an IOException during the call it is set in an instance<a name="line.242"></a>
<FONT color="green">243</FONT>            // variable of the MultithreadedMapRunner from where it will be<a name="line.243"></a>
<FONT color="green">244</FONT>            // rethrown.<a name="line.244"></a>
<FONT color="green">245</FONT>            synchronized (MultithreadedMapRunner.this) {<a name="line.245"></a>
<FONT color="green">246</FONT>              if (MultithreadedMapRunner.this.ioException == null) {<a name="line.246"></a>
<FONT color="green">247</FONT>                MultithreadedMapRunner.this.ioException = ex;<a name="line.247"></a>
<FONT color="green">248</FONT>              }<a name="line.248"></a>
<FONT color="green">249</FONT>            }<a name="line.249"></a>
<FONT color="green">250</FONT>          } catch (RuntimeException ex) {<a name="line.250"></a>
<FONT color="green">251</FONT>            // If there is a RuntimeException during the call it is set in an<a name="line.251"></a>
<FONT color="green">252</FONT>            // instance variable of the MultithreadedMapRunner from where it will be<a name="line.252"></a>
<FONT color="green">253</FONT>            // rethrown.<a name="line.253"></a>
<FONT color="green">254</FONT>            synchronized (MultithreadedMapRunner.this) {<a name="line.254"></a>
<FONT color="green">255</FONT>              if (MultithreadedMapRunner.this.runtimeException == null) {<a name="line.255"></a>
<FONT color="green">256</FONT>                MultithreadedMapRunner.this.runtimeException = ex;<a name="line.256"></a>
<FONT color="green">257</FONT>              }<a name="line.257"></a>
<FONT color="green">258</FONT>            }<a name="line.258"></a>
<FONT color="green">259</FONT>          }<a name="line.259"></a>
<FONT color="green">260</FONT>        }<a name="line.260"></a>
<FONT color="green">261</FONT>      }<a name="line.261"></a>
<FONT color="green">262</FONT>    <a name="line.262"></a>
<FONT color="green">263</FONT>    }<a name="line.263"></a>




























































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