What is the Series for the uefa cup, in the 2006–07 season, and a Round of group, and an opponent of az?
CREATE TABLE "2000s_incorporation" (
  "season" text,
  "competition" text,
  "round" text,
  "opponent" text,
  "series" text
);
SELECT "series" FROM "2000s_incorporation" WHERE "competition"='uefa cup' AND "season"='2006–07' AND "round"='group' AND "opponent"='az';