CREATE TABLE table_77985 ("Line" CLOB, "Began operation" FLOAT, "Stations" FLOAT, "Length  ( km ) " CLOB, "Terminals" CLOB)

When is the earliest began operation with a length of sultan ismail and over 27 stations?
SELECT MIN("Began operation") FROM table_77985 WHERE "Length (km)" = 'sultan ismail' AND "Stations" > '27'
SELECT MIN("Began operation") FROM "table_77985" WHERE "Length (km)" = 'sultan ismail' AND "Stations" > '27'