anchor.diff:            pie_chart({
               'simple words'  => analysis.simple_words_count,
               'complex words' => analysis.complex_words_count
  -          })
  +          }, colors: ["#0f0", "#ff0"])
           %>
         </div>
         <div class="card-action">
  
positive.code:           pie_chart({
              'exactly once'   => analysis.words_used_once_count, 
              'multiple times' => analysis.words_used_repeatedly_count
            })
          %>
        </div>
        <div class="card-action">
  
negative.code:   <div class="col s12">
      <div class="card">
        <div class="card-content">
          <div class="card-title">Number of N-syllable words</div>
          <%= column_chart(analysis.n_syllable_words.map { |k, v| [k, v] }, colors: ["#8f8"]) %>
        </div>
      </div>
    </div>
  