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  <title>tf (RIR::Document)</title>
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  <pre><span class="ruby-comment cmt"># File lib/rir/document.rb, line 94</span>
    <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">tf</span>(<span class="ruby-identifier">s</span>)
      <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">count_words</span>[<span class="ruby-identifier">s</span>].<span class="ruby-identifier">to_f</span><span class="ruby-operator">/</span><span class="ruby-ivar">@words</span>.<span class="ruby-identifier">size</span>.<span class="ruby-identifier">to_f</span>
    <span class="ruby-keyword kw">end</span></pre>
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