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_78 (civil_liberties INTEGER, year VARCHAR, political_rights VARCHAR, president VARCHAR)

### Question ###
When the president was Yoweri Museveni, and the year was 1993, with rank of 6 under political rights, what was the total of civil liberties?

### Accurate SQL ###

SELECT SUM(civil_liberties) FROM table_name_78 WHERE political_rights = 6 AND president = "yoweri museveni" AND year = 1993