What episode number is presented by Ben Okri ?
CREATE TABLE table_15211468_3 (episode_no VARCHAR, presenter VARCHAR)
SELECT episode_no FROM table_15211468_3 WHERE presenter = "Ben Okri"
### Context: CREATE TABLE table_15211468_3 (episode_no VARCHAR, presenter VARCHAR) ### Question: What episode number is presented by Ben Okri ? ### Answer: SELECT episode_no FROM table_15211468_3 WHERE presenter = "Ben Okri"