CREATE TABLE table_51913 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

Who was away team at the home game of south melbourne?
SELECT "Away team" FROM table_51913 WHERE "Home team" = 'south melbourne'
SELECT "Away team" FROM "table_51913" WHERE "Home team" = 'south melbourne'