CREATE TABLE table_9778 ("Rank" FLOAT, "Peak Name" CLOB, "Elevation  ( ft ) " FLOAT, "Range" CLOB, "Isolation" FLOAT)

WHAT IS THE ELEVATION OF THE UNAKA MOUNTAINS, IN ROAN HIGH BLUFF PEAK, AND ISOLATION LARGER THAN 1.54?
SELECT AVG("Elevation (ft)") FROM table_9778 WHERE "Range" = 'unaka mountains' AND "Peak Name" = 'roan high bluff' AND "Isolation" > '1.54'
SELECT AVG("Elevation (ft)") FROM "table_9778" WHERE "Isolation" > '1.54' AND "Peak Name" = 'roan high bluff' AND "Range" = 'unaka mountains'