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411de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">001</FONT>    // Copyright (c) 2011, Mike Samuel<a name="line.1"></a>
511de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">002</FONT>    // All rights reserved.<a name="line.2"></a>
611de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">003</FONT>    //<a name="line.3"></a>
711de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">004</FONT>    // Redistribution and use in source and binary forms, with or without<a name="line.4"></a>
811de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">005</FONT>    // modification, are permitted provided that the following conditions<a name="line.5"></a>
911de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">006</FONT>    // are met:<a name="line.6"></a>
1011de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">007</FONT>    //<a name="line.7"></a>
1111de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">008</FONT>    // Redistributions of source code must retain the above copyright<a name="line.8"></a>
1211de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">009</FONT>    // notice, this list of conditions and the following disclaimer.<a name="line.9"></a>
1311de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">010</FONT>    // Redistributions in binary form must reproduce the above copyright<a name="line.10"></a>
1411de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">011</FONT>    // notice, this list of conditions and the following disclaimer in the<a name="line.11"></a>
1511de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">012</FONT>    // documentation and/or other materials provided with the distribution.<a name="line.12"></a>
1611de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">013</FONT>    // Neither the name of the OWASP nor the names of its contributors may<a name="line.13"></a>
1711de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">014</FONT>    // be used to endorse or promote products derived from this software<a name="line.14"></a>
1811de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">015</FONT>    // without specific prior written permission.<a name="line.15"></a>
1911de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">016</FONT>    // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS<a name="line.16"></a>
2011de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">017</FONT>    // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT<a name="line.17"></a>
2111de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">018</FONT>    // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS<a name="line.18"></a>
2211de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">019</FONT>    // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE<a name="line.19"></a>
2311de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">020</FONT>    // COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,<a name="line.20"></a>
2411de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">021</FONT>    // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,<a name="line.21"></a>
2511de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">022</FONT>    // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;<a name="line.22"></a>
2611de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">023</FONT>    // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER<a name="line.23"></a>
2711de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">024</FONT>    // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT<a name="line.24"></a>
2811de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">025</FONT>    // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN<a name="line.25"></a>
2911de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">026</FONT>    // ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE<a name="line.26"></a>
3011de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">027</FONT>    // POSSIBILITY OF SUCH DAMAGE.<a name="line.27"></a>
3111de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">028</FONT>    <a name="line.28"></a>
3211de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">029</FONT>    package org.owasp.html;<a name="line.29"></a>
3311de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">030</FONT>    <a name="line.30"></a>
342cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">031</FONT>    import com.google.common.collect.ImmutableList;<a name="line.31"></a>
352cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">032</FONT>    import java.util.Collection;<a name="line.32"></a>
362cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">033</FONT>    import java.util.Set;<a name="line.33"></a>
372cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">034</FONT>    import java.util.LinkedHashSet;<a name="line.34"></a>
382cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">035</FONT>    import javax.annotation.CheckReturnValue;<a name="line.35"></a>
392cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">036</FONT>    import javax.annotation.Nullable;<a name="line.36"></a>
402cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">037</FONT>    import javax.annotation.concurrent.Immutable;<a name="line.37"></a>
412cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">038</FONT>    <a name="line.38"></a>
422cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">039</FONT>    /**<a name="line.39"></a>
432cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">040</FONT>     * A policy that can be applied to an HTML attribute to decide whether or not to<a name="line.40"></a>
442cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">041</FONT>     * allow it in the output, possibly after transforming its value.<a name="line.41"></a>
452cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">042</FONT>     *<a name="line.42"></a>
462cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">043</FONT>     * @author Mike Samuel &lt;mikesamuel@gmail.com&gt;<a name="line.43"></a>
472cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">044</FONT>     * @see HtmlPolicyBuilder.AttributeBuilder#matching(AttributePolicy)<a name="line.44"></a>
482cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">045</FONT>     */<a name="line.45"></a>
492cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">046</FONT>    @TCB public interface AttributePolicy {<a name="line.46"></a>
502cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">047</FONT>    <a name="line.47"></a>
512cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">048</FONT>      /**<a name="line.48"></a>
522cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">049</FONT>       * @param elementName the lower-case element name.<a name="line.49"></a>
532cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">050</FONT>       * @param attributeName the lower-case attribute name.<a name="line.50"></a>
542cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">051</FONT>       * @param value the attribute value without quotes and with HTML entities<a name="line.51"></a>
552cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">052</FONT>       *     decoded.<a name="line.52"></a>
562cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">053</FONT>       *<a name="line.53"></a>
572cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">054</FONT>       * @return {@code null} to disallow the attribute or the adjusted value if<a name="line.54"></a>
582cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">055</FONT>       *     allowed.<a name="line.55"></a>
592cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">056</FONT>       */<a name="line.56"></a>
602cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">057</FONT>      public @Nullable String apply(<a name="line.57"></a>
612cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">058</FONT>          String elementName, String attributeName, String value);<a name="line.58"></a>
622cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">059</FONT>    <a name="line.59"></a>
632cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">060</FONT>    <a name="line.60"></a>
642cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">061</FONT>      /** Utilities for working with attribute policies. */<a name="line.61"></a>
652cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">062</FONT>      public static final class Util {<a name="line.62"></a>
662cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">063</FONT>    <a name="line.63"></a>
672cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">064</FONT>        /**<a name="line.64"></a>
682cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">065</FONT>         * An attribute policy equivalent to applying all the given policies in<a name="line.65"></a>
692cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">066</FONT>         * order, failing early if any of them fails.<a name="line.66"></a>
702cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">067</FONT>         */<a name="line.67"></a>
712cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">068</FONT>        @CheckReturnValue<a name="line.68"></a>
722cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">069</FONT>        public static final AttributePolicy join(AttributePolicy... policies) {<a name="line.69"></a>
732cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">070</FONT>          Set&lt;AttributePolicy&gt; uniq = new LinkedHashSet&lt;AttributePolicy&gt;();<a name="line.70"></a>
742cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">071</FONT>          for (AttributePolicy p : policies) {<a name="line.71"></a>
752cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">072</FONT>            if (p instanceof JoinedAttributePolicy) {<a name="line.72"></a>
762cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">073</FONT>              uniq.addAll(((JoinedAttributePolicy) p).policies);<a name="line.73"></a>
772cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">074</FONT>            } else if (p != null) {<a name="line.74"></a>
782cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">075</FONT>              uniq.add(p);<a name="line.75"></a>
792cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">076</FONT>            }<a name="line.76"></a>
802cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">077</FONT>          }<a name="line.77"></a>
812cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">078</FONT>    <a name="line.78"></a>
822cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">079</FONT>          if (uniq.contains(REJECT_ALL_ATTRIBUTE_POLICY)) {<a name="line.79"></a>
832cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">080</FONT>            return REJECT_ALL_ATTRIBUTE_POLICY;<a name="line.80"></a>
842cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">081</FONT>          }<a name="line.81"></a>
852cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">082</FONT>          uniq.remove(IDENTITY_ATTRIBUTE_POLICY);<a name="line.82"></a>
862cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">083</FONT>          switch (uniq.size()) {<a name="line.83"></a>
872cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">084</FONT>            case 0:  return IDENTITY_ATTRIBUTE_POLICY;<a name="line.84"></a>
882cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">085</FONT>            case 1:  return uniq.iterator().next();<a name="line.85"></a>
892cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">086</FONT>            default: return new JoinedAttributePolicy(uniq);<a name="line.86"></a>
9011de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">087</FONT>          }<a name="line.87"></a>
912cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">088</FONT>        }<a name="line.88"></a>
922cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">089</FONT>      }<a name="line.89"></a>
932cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">090</FONT>    <a name="line.90"></a>
942cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">091</FONT>    <a name="line.91"></a>
952cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">092</FONT>      public static final AttributePolicy IDENTITY_ATTRIBUTE_POLICY<a name="line.92"></a>
962cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">093</FONT>          = new AttributePolicy() {<a name="line.93"></a>
972cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">094</FONT>            public String apply(<a name="line.94"></a>
982cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">095</FONT>                String elementName, String attributeName, String value) {<a name="line.95"></a>
992cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">096</FONT>              return value;<a name="line.96"></a>
1002cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">097</FONT>            }<a name="line.97"></a>
1012cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">098</FONT>          };<a name="line.98"></a>
1022cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">099</FONT>    <a name="line.99"></a>
1032cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">100</FONT>      public static final AttributePolicy REJECT_ALL_ATTRIBUTE_POLICY<a name="line.100"></a>
1042cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">101</FONT>          = new AttributePolicy() {<a name="line.101"></a>
1052cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">102</FONT>            public @Nullable String apply(<a name="line.102"></a>
1062cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">103</FONT>                String elementName, String attributeName, String value) {<a name="line.103"></a>
1072cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">104</FONT>              return null;<a name="line.104"></a>
1082cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">105</FONT>            }<a name="line.105"></a>
1092cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">106</FONT>          };<a name="line.106"></a>
1102cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">107</FONT>    <a name="line.107"></a>
1112cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">108</FONT>    }<a name="line.108"></a>
1122cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">109</FONT>    <a name="line.109"></a>
1132cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">110</FONT>    @Immutable<a name="line.110"></a>
1142cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">111</FONT>    final class JoinedAttributePolicy implements AttributePolicy {<a name="line.111"></a>
1152cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">112</FONT>      final ImmutableList&lt;AttributePolicy&gt; policies;<a name="line.112"></a>
1162cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">113</FONT>    <a name="line.113"></a>
1172cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">114</FONT>      JoinedAttributePolicy(Collection&lt;? extends AttributePolicy&gt; policies) {<a name="line.114"></a>
1182cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">115</FONT>        this.policies = ImmutableList.copyOf(policies);<a name="line.115"></a>
1192cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">116</FONT>      }<a name="line.116"></a>
1202cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">117</FONT>    <a name="line.117"></a>
1212cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">118</FONT>      public @Nullable String apply(<a name="line.118"></a>
1222cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">119</FONT>          String elementName, String attributeName, @Nullable String value) {<a name="line.119"></a>
1232cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">120</FONT>        for (AttributePolicy p : policies) {<a name="line.120"></a>
1242cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">121</FONT>          if (value == null) { break; }<a name="line.121"></a>
1252cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">122</FONT>          value = p.apply(elementName, attributeName, value);<a name="line.122"></a>
1262cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">123</FONT>        }<a name="line.123"></a>
1272cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">124</FONT>        return value;<a name="line.124"></a>
1282cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">125</FONT>      }<a name="line.125"></a>
1292cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">126</FONT>    <a name="line.126"></a>
1302cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">127</FONT>      @Override<a name="line.127"></a>
1312cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">128</FONT>      public boolean equals(Object o) {<a name="line.128"></a>
1322cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">129</FONT>        return o != null &amp;&amp; this.getClass() == o.getClass()<a name="line.129"></a>
1332cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">130</FONT>            &amp;&amp; policies.equals(((JoinedAttributePolicy) o).policies);<a name="line.130"></a>
13411de3758b3338ab796baa74df47f9a9a937ff103mikesamuel<FONT color="green">131</FONT>      }<a name="line.131"></a>
1352cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">132</FONT>    <a name="line.132"></a>
1362cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">133</FONT>      @Override<a name="line.133"></a>
1372cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">134</FONT>      public int hashCode() {<a name="line.134"></a>
1382cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">135</FONT>        return policies.hashCode();<a name="line.135"></a>
1392cf15c456fb69a6f1d12f704dcdf4a0164963fd9mikesamuel<FONT color="green">136</FONT>      }<a name="line.136"></a>
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