CREATE TABLE table_56742 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

If collingwood is playing away, who played as the home team?
SELECT "Home team" FROM table_56742 WHERE "Away team" = 'collingwood'
SELECT "Home team" FROM "table_56742" WHERE "Away team" = 'collingwood'