CREATE TABLE table_39864 ("SEASON" TEXT, "FIRST" TEXT, "SECOND" TEXT, "THIRD" TEXT, "FOURTH" TEXT, "FIFTH" TEXT, "SIXTH" TEXT)

What team placed sixth during the season where Tasmania placed second and Western Australia placed fourth?
SELECT "SIXTH" FROM table_39864 WHERE "SECOND" = 'tasmania' AND "FOURTH" = 'western australia'
SELECT "SIXTH" FROM "table_39864" WHERE "FOURTH" = 'western australia' AND "SECOND" = 'tasmania'