Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: 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?

### Accurate SQL ###

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