title: While loop with an "OR" condition
body: <p>Below is a code snippet that asks for user input, and if the input is not either "csv" or "newline", the while loop is called. </p>
  
  <p>For line 5, what is the correct syntax for the while loop where it attempts to match <code>$format</code> to either "csv" or "newline"? Currently it is only seems to be matching "csv".</p>
  
  <pre><code>1 # Request output format
  2 print "Format of email addresses required (csv|newline): ";
  3 $format = &lt;&gt;;
  4 chop($format);
  5 while ($format ne ("csv"||"newline")) {
  6   print "Invalid format. Enter in csv or newline: ";
  7   $format = &lt;&gt;;
  8   chop($format);
  9 }
  </code></pre>