CREATE TABLE table_20466963_4 (guest_2 VARCHAR(255), guest_4 VARCHAR(255), guest_3 VARCHAR(255))
Who is the guest 2 in the episode where guest 4 is Iyare Igiehon and guest 3 is John Oliver?
    
SQL: SELECT guest_2 FROM table_20466963_4 WHERE guest_4 = "Iyare Igiehon" AND guest_3 = "John Oliver"