Nome do Social Sec Leeds tem Fixtures Sec de n/a, e um General Sec de n/a, e a Temporada de 20052006?
CREATE TABLE table_name_23 (social_sec_leeds VARCHAR, season VARCHAR, fixtures_sec VARCHAR, general_sec VARCHAR)
SELECT social_sec_leeds FROM table_name_23 WHERE fixtures_sec = "n/a" AND general_sec = "n/a" AND season = "2005–2006"