anchor.diff:                                  </div>
                                   <div class="project-name">
                                       <% @glass_examples.each do |glass_example| %>
  -                                        <%= glass_example %>
  +                                        <%= glass_example %><%= "," unless glass_example == @glass_examples.last %>
                                       <% end %>
                                   </div>
                               </div>
  
positive.code:                                 </div>
                                  <div class="project-name">
                                      <% @metals_examples.each do |metals_example| %>
                                          <%= metals_example %>
                                      <% end %>
                                  </div>
                              </div>
  
negative.code:                                 </div>
                                  <div class="project-name">
                                      <% @papers_examples.each do |papers_example| %>
                                          <%= papers_example %><%= "," unless papers_example == @papers_examples.last %>
                                      <% end %>
                                  </div>
                              </div>
  