CREATE TABLE table_name_78 (civil_liberties INT, year VARCHAR, political_rights VARCHAR, president VARCHAR)

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