CREATE TABLE table_73371 ("Election" TEXT, "Mayor" TEXT, "Seat no 1" TEXT, "Seat no 2" TEXT, "Seat no 3" TEXT, "Seat no 4" TEXT, "Seat no 5" TEXT, "Seat no 6" TEXT)

Who was seat no 6 when seat no 1 and seat no 5 were jacques lachapelle and donald s. dutton
SELECT "Seat no 6" FROM table_73371 WHERE "Seat no 1" = 'Jacques Lachapelle' AND "Seat no 5" = 'Donald S. Dutton'
SELECT "Seat no 6" FROM "table_73371" WHERE "Seat no 1" = 'Jacques Lachapelle' AND "Seat no 5" = 'Donald S. Dutton'