title: Relationships between actors in Use Case diagram
body: <p>I'm wondering is it a mistake or I don't understand it correctly. As I know we use arrows between actors to present generalization (Student &lt;- Undergraduate student), but how to interpret it in those 2 cases? (Cause Graduated Student is not more specified Undergraduate Student)</p>
  
  <p><a href="https://i.stack.imgur.com/fOzSG.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fOzSG.jpg" alt="enter image description here"></a></p>
  
  <p>Thank You in advance!</p>