anchor.diff:                                  </div>
                                   <div class="project-name">
                                       <% @papers_examples.each do |papers_example| %>
  -                                        <%= papers_example %>
  +                                        <%= papers_example %><%= "," unless papers_example == @papers_examples.last %>
                                       <% end %>
                                   </div>
                               </div>
  
positive.code:                                     E-waste, batteries, and lights
                                  </div>
                                  <div class="project-name">
                                      <% @electronics_examples.each do |electronics_example| %>
                                          <%= electronics_example %>
                                      <% end %> 
                                  </div>
                              </div>
  
negative.code:                                 </div>
                                  <div class="project-name">
                                      <% @plastic_examples.each do |plastic_example| %>
                                          <%= plastic_example %><%= "," unless plastic_example == @plastic_examples.last %>
                                      <% end %>
                                  </div>
                              </div>
  