CREATE TABLE table_78343 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

When collingwood was the away team, what was the home team?
SELECT "Home team" FROM table_78343 WHERE "Away team" = 'collingwood'
SELECT "Home team" FROM "table_78343" WHERE "Away team" = 'collingwood'