user: ### NOW ANSWER:
Question: Who is the writer of episode 13?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [132.0, 1.0, '"Magnificent Seven"', 'Gerry Cohen', 'Arthur Silver', 'September 13, 1992', '7.01']
SQL:

assistant: SELECT COUNT("Written by") FROM "Table" WHERE "No. in season" = 13.0;