CREATE TABLE table_32668 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Record" TEXT, "Attendance" FLOAT)

Who was the opponent before week 6 at cleveland municipal stadium?
SELECT "Opponent" FROM table_32668 WHERE "Week" < '6' AND "Game site" = 'cleveland municipal stadium'
SELECT "Opponent" FROM "table_32668" WHERE "Game site" = 'cleveland municipal stadium' AND "Week" < '6'