The Board may fill any casual vacancies that may occur in the GEM Listing Committee by reason of resignation, retirement or otherwise. A person eligible for appointment to fill any such casual vacancy shall be nominated by the Listing Nominating Committee and shall be a person who is eligible within the same category of rule 3.18 as the member who has vacated office. The term of a member appointed to fill a casual vacancy in an office shall end on the same date as the term of the member whose vacation from that office created the casual vacancy.