CREATE TABLE table_6066 ("Year" TEXT, "League" TEXT, "Season" TEXT, "Play-Off" TEXT, "Baltic" TEXT, "Events" TEXT, "European" TEXT)

Which European has a Play-Off of relegated?
SELECT "European" FROM table_6066 WHERE "Play-Off" = 'relegated'
SELECT "European" FROM "table_6066" WHERE "Play-Off" = 'relegated'