SELECT name FROM table_name_64 WHERE heat < 3 AND rank < 18 AND nationality = "east germany" AND time = "2:35.31"
CREATE TABLE table_name_64 (name VARCHAR, time VARCHAR, nationality VARCHAR, heat VARCHAR, rank VARCHAR)
what is the name when the heat is less than 3, the rank is less than 18, the nationality is east germany and the time is 2:35.31?