user: ### NOW ANSWER:
Question: What series number was directed by Milan Cheylov and written by Will Dixon?
Columns: ['Series #', 'Title', 'Directed by', 'Written by', 'Original air date']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Dream House / UFO Encounter"', 'Allan Kroeker', 'Will Dixon / James Nadler', 'September 28, 1996']
SQL:

assistant: SELECT AVG("Series #") FROM "Table" WHERE "Directed by" = 'Milan Cheylov' AND "Written by" = 'Will Dixon';