law: 7. Casual vacancies.-
  A casual vacancy in the Council shall be filled by nomination or election, as the case may be, and the person nominated or elected to fill the vacancy shall hold office only for the remainder of the term for which the member whose place he takes was nominated or elected:
  Provided that no such casual vacancy occurring within three months of the date of expiry of the normal term of office of a nominated or an elected member need be filled under this section.