document.write('
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  1. public void setRefNumber(String ref)
  2. {
  3.     if(ref.length() >= 3) {
  4.         refNumber = ref;
  5.     }
  6.     else {
  7.         System.out.println("Error! The reference number must be at least 3 characters long.");
  8.     }
  9. }
');