user: Question: How many people wrote episode 68 in the series?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [62.0, 1.0, '"Gypsy Eyes (Part 2)"', 'Tony Wharmby', 'Donald P. Bellisario', 'September 22, 1998']
SQL:

assistant: SELECT COUNT("Written by") FROM "Table" WHERE "No. in series" = 68.0;