Who is the guest 2 in the episode where guest 4 is Iyare Igiehon and guest 3 is John Oliver?
CREATE TABLE "season_2006_07" (
  "date" text,
  "presenter" text,
  "guest_1" text,
  "guest_2" text,
  "guest_3" text,
  "guest_4" text
);
SELECT "guest_2" FROM "season_2006_07" WHERE "guest_4"='Iyare Igiehon' AND "guest_3"='John Oliver';