When a question is under debate, no motion other than pertinent incidental motions shall be entertained except to adjourn or recess, to lay on the table, for the previous question, to postpone for a definite time, to refer to committee, to amend, or to postpone indefinitely, which motions shall have precedence in the order above named and only the motions to postpone for a definite time, to refer to committee, to amend, and to postpone indefinitely shall be debatable. (Ord. 79-97 § 2 (part), 1979).