SCHEMA:
CREATE TABLE table_name_23 (social_sec_leeds VARCHAR, season VARCHAR, fixtures_sec VARCHAR, general_sec VARCHAR)
USER:
Name the Social Sec Leeds has Fixtures Sec of n/a, and a General Sec of n/a, and the Season of 2005–2006?

QUERY:
SELECT social_sec_leeds FROM table_name_23 WHERE fixtures_sec = "n/a" AND general_sec = "n/a" AND season = "2005–2006"