</span>
302:     <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">clone</span>
303:       <span class="ruby-identifier">sibling</span> = <span class="ruby-identifier">dup</span>
304:       <span class="ruby-identifier">sibling</span>.<span class="ruby-identifier">freeze</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">frozen?</span>
305:       <span class="ruby-identifier">sibling</span>
306:     <span class="ruby-keyword kw">end</span></pre>
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