anchor.diff:        <% end %>
       </ul>
   
  -    <% else %>
  -
  -    None.
  -
       <% end %>
   
     </div>
  
positive.code: 
    <div class="container">
      <h1>
        <% group['prefix_pairs'].each do |prefix, combined| %>
        <a href="<%= combined.join('.') %>.html"><%= prefix %></a>
        <% end %>
      </h1>
  
      <h2><%= group['doc'] %></h2>
  
      <ul>
        <% group['subitems'].each do |item| %>
  
negative.code:       body {
          margin: 0;
          background-color: #eee;
          font-family: 'Helvetica Neue', sans-serif;
        }
  
        h1 {
          margin-top: 0;
        }
  
        section {
          border-top: 1px solid #ccc;
        }
  
        section:last-of-type {
          border-bottom: 1px solid #ccc;
        }
  
        a {
  