21.   The seats became vacant when Democratic Sen. Joe Maxwell became lieutenant governor, and Republican Sam Graves and Democrat William Lacy Clay were elected to House seats.

22.   The seat became available when the former deputy became head of the district administration.

23.   The seat became open when Rep. Bob Franks, R-Berkeley Heights, decided to run for Senate.

24.   Two seats recently became vacant.

25.   Two students in the New York crash were believed to have suffered more serious injuries because their seats became unlatched during the collision, investigators said.