sentences:  A player could be substituted for any reason; however, once substituted, a player could not return to the field of play under any circumstances.Teams played each other in a home-and-away season of 18 rounds; matches 12 to 18 were the "home-and-way reverse" of matches 1 to 7.Once the 18 round home-and-away season had finished, the 1951 VFL "Premiers" were determined by the specific format and conventions of the Page–McIntyre system.