CREATE TABLE table_67242 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

What entrant had a Maserati 250F chassis and fewer than 6 points before 1957?
SELECT "Entrant" FROM table_67242 WHERE "Chassis" = 'maserati 250f' AND "Year" < '1957' AND "Points" < '6'
SELECT "Entrant" FROM "table_67242" WHERE "Chassis" = 'maserati 250f' AND "Points" < '6' AND "Year" < '1957'