Table schema:
CREATE TABLE table_name_91 (seats_2001 INTEGER, parties_and_voter_communities VARCHAR, seats_2006 VARCHAR)

Question: 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