CREATE TABLE table_66232 ("Year" FLOAT, "Stage" FLOAT, "Start" TEXT, "Finish" TEXT, "Leader at the summit" TEXT)

Who was the leader at the summit earlier than 1956, when Carcassonne shows for finish?
SELECT "Leader at the summit" FROM table_66232 WHERE "Year" < '1956' AND "Finish" = 'carcassonne'
SELECT "Leader at the summit" FROM "table_66232" WHERE "Finish" = 'carcassonne' AND "Year" < '1956'