title: Issue with implementing synchronous operation in activity diagram
body: <p>I want to draw activity diagram to test a specific phone. I have tried to start with synchronous operation on choosing 3 random phone . can you please check if I have done them correctly , just started learning this process and couldn't figure out if I have to use synchronous or loop for choosing 3 random phone as well</p>
  <ol>
  <li>To that I am choosing  3 same type phone randomly for the test.</li>
  <li>Initially I check for packaging damage - if it had damage then return to production manager</li>
  <li>If no package damage - then open box and check for physical damage - if damage found then return to production manger</li>
  <li>if no physical damage then test for functionality damage - if no damage then <a href="https://i.stack.imgur.com/7DiBg.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7DiBg.png" alt="enter image description here" /></a>consider the product as Test passed.</li>
  </ol>