user: Question: Name who wrote the episode that had 7.56 million viewers
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (millions)']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['54/55', '1/2', '" Fun Run "‡', 'Greg Daniels', 'Greg Daniels', 'September27,2007', '4001/4002', '9.7']
SQL:

assistant: SELECT "Written by" FROM "Table" WHERE "U.S. viewers (millions)" = '7.56';