Question: What is the original air date for episode graeme clifford directed and lindsay sturman wrote?
Schema: create table table_28859177_3 (original_air_date varchar, directed_by varchar, written_by varchar, PRIMARY KEY (original_air_date))
SQL: select original_air_date from table_28859177_3 where directed_by = "graeme clifford" and written_by = "lindsay sturman"