title: Login/logout use case
body: <p>Suddenly I've been in need of making an use case and I've stumped over a dilemma with the login/logout.</p>
  
  <p>A co-worker tells me that they should be a use case by themselves like:</p>
  
  <pre><code>[login, admin stuff, logout]
  </code></pre>
  
  <p>But my brain yells at me that login should be an include of the use cases that needs a login while logout should be an extend of login.</p>
  
  <pre><code>[admin stuff -include&gt; login -extends&gt; logout]
  </code></pre>
  
  <p>So, which one?</p>