anchor.diff:  
     var word_variety_chart = Highcharts.chart('graph-word-variety', {
       chart: {
  -      type: 'pie'
  +        type: 'pie'
  +    },
  +    title: {
  +        text: 'Number of words used...'
       },
       series: [{
  -      name: 'Words used exactly once',
  -      y: <%= analysis.words_used_once_count %>,
  -      sliced: true,
  -      selected: true
  -    }, {
  -      name: 'Words used multiple times',
  -      y: <%= analysis.words_used_repeatedly_count %>,
  +        name: 'Words',
  +        colorByPoint: true,
  +        data: [{
  +            name: 'once',
  +            y: <%= analysis.words_used_once_count %>,
  +            sliced: true,
  +            selected: true
  +        }, {
  +            name: 'multiple times',
  +            y: <%= analysis.words_used_repeatedly_count %>
  +        }]
  +    }]
  +  });
  +
  +  var word_complexity_chart = Highcharts.chart('graph-word-complexity', {
  +    chart: {
  +        type: 'pie'
  +    },
  +    title: {
  +        text: 'Number of...'
  +    },
  +    series: [{
  +        name: 'Words',
  +        colorByPoint: true,
  +        data: [{
  +            name: 'simple words',
  +            y: <%= analysis.simple_words_count %>,
  +            sliced: true,
  +            selected: true
  +        }, {
  +            name: 'complex words',
  +            y: <%= analysis.complex_words_count %>
  +        }]
       }]
     });
   
  
positive.code:   </div>
  
    <div class="col s12 m6">
      <div class="card blue lighten-3">
        <div class="card-content white-text">
          <div class="card-title">Word variety</div>
          <p>
            <%= pie_chart({
              'Words used multiple times' => analysis.words_used_repeatedly_count,
              'Words used exactly once' => analysis.words_used_once_count
            }) %>
          </p>
          <div id="graph-word-variety"></div>
        </div>
        <div class="card-action">
  
negative.code:   </div>
  
    <div class="col s12 m6">
      <div class="card">
        <div class="card-content">
          <div class="card-title">Word complexity</div>
          <div id="graph-word-complexity"></div>
        </div>
        <div class="card-action">
          <a class="activator blue-text text-darken-4">
            Why is this important?
          </a>
        </div>
        <div class="card-reveal">
  