What episode number in the season was written by Greg nelson and directed by Keith samples?
CREATE TABLE table_27547668_3 (no VARCHAR, written_by VARCHAR, directed_by VARCHAR)
SELECT no FROM table_27547668_3 WHERE written_by = "Greg Nelson" AND directed_by = "Keith Samples"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: 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? [/INST] SELECT no FROM table_27547668_3 WHERE written_by = "Greg Nelson" AND directed_by = "Keith Samples" </s>