title: use case include
body: <p>I have use case <code>order book</code>, when the user order a book he must browse the book ( use case <code>browse books</code>) then he must set the address to take the book (use case <code>set address</code>)
  what is the relationship between the two usecases with <code>order book</code> usecase?</p>
  
  <pre><code>Include ?
  Extend?
  Something Else?
  </code></pre>