Table schema:
CREATE TABLE table_name_64 (name VARCHAR, time VARCHAR, nationality VARCHAR, heat VARCHAR, rank VARCHAR)

Question: 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?
SQL: SELECT name FROM table_name_64 WHERE heat < 3 AND rank < 18 AND nationality = "east germany" AND time = "2:35.31"