anchor.diff:      <td><%= landmark.answer3 %></td>
       <td><%= landmark.correct %></td>
       <td><%= landmark.author %></td>
  -    <td><%= link_to '詳細表示', landmark %></td>
  -    <td><%= link_to '編集', edit_landmark_path(landmark) %></td>
     </tr>
   <% end %>
   </table>
  
positive.code:     <th>答3</th>
      <th>正解番号</th>
      <th>作成者</th>
      <th></th>
      <th></th>
    </tr>
  
  <% @landmarks.each do |landmark| %>
    <tr>
      <td><%= landmark.name %></td>
      <td><%= map_link(landmark) %></td>
      <td><%= link_to landmark.url, landmark.url, target: "_blank" %></td>
  
negative.code: 
  <table>
    <tr>
      <th></th>
      <th>名前</th>
      <th>緯度・経度</th>
      <th>URL</th>
  