CREATE TABLE table_name_91 (seats_2001 INTEGER, parties_and_voter_communities VARCHAR(255), seats_2006 VARCHAR(255))
what is the total number of seats 2001 with seats 2006 more than 10 and voter communities of cdu?
    
SQL: SELECT SUM(seats_2001) FROM table_name_91 WHERE parties_and_voter_communities = "cdu" AND seats_2006 > 10