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 teachers ( lastname text, firstname text, classroom number )
TABLE: CREATE TABLE list ( lastname text, firstname text, grade number, classroom number )

### Question ###
Which students in third grade are not taught by teacher COVIN JEROME? Give me the last names of the students.

### Accurate SQL ###

SELECT DISTINCT T1.lastname FROM list AS T1 JOIN teachers AS T2 ON T1.classroom = T2.classroom WHERE T1.grade = 3 AND T2.firstname <> "COVIN" AND T2.lastname <> "JEROME"