Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_27547668_3 (no VARCHAR, written_by VARCHAR, directed_by VARCHAR)
### Question:
What episode number in the season was written by Greg nelson and directed by Keith samples?
### Answer:
SELECT no FROM table_27547668_3 WHERE written_by = "Greg Nelson" AND directed_by = "Keith Samples"