CREATE TABLE table_name_81 (nationality VARCHAR2, heat VARCHAR2, time VARCHAR2)

what is the nationality when the heat is less than 3 and the time is 2:35.31?
SELECT nationality FROM table_name_81 WHERE heat < 3 AND time = "2:35.31"
SELECT "nationality" FROM "table_name_81" WHERE "2:35.31" = "time" AND "heat" < 3