Table schema:
CREATE TABLE table_name_35 (series VARCHAR, opponent VARCHAR, round VARCHAR, competition VARCHAR, season VARCHAR)

Question: What is the Series for the uefa cup, in the 2006–07 season, and a Round of group, and an opponent of az?
SQL: SELECT series FROM table_name_35 WHERE competition = "uefa cup" AND season = "2006–07" AND round = "group" AND opponent = "az"