Sec.  5.67   Amendment or dismissal of applications.

   (a) Any application may be amended or dismissed without prejudice upon
   request of the applicant prior to the time the application is granted. Each
   amendment to, or request for dismissal of an application shall be signed,
   authenticated, and submitted in the same manner and with the same number of
   copies  as  required  for  the  original  application.  All subsequent
   correspondence  or  other  material that the applicant desires to have
   incorporated as a part of an application already filed shall be submitted in
   the form of an amendment to the application.

   (b) Failure to prosecute an application, or failure to respond to official
   correspondence or request for additional information, will be cause for
   dismissal. Such dismissal will be without prejudice.