These Rules may not be amended unless the proposed amendment: is prepared by the Department of Legislative Reference in the same form and manner as that required for an amendment to a bill; is submitted to the Council with all introductory legislation, if any, at least 1 regular meeting before it is considered; is adopted by the affirmative vote of 2/3 of all Councilmembers (10); and for any proposed amendment to Rule 5-11 {“Vacancy”}, has had a public hearing before it is considered.