user: Question: How many viewers did the episode written by Warren Lieberstein & Halsted Sullivan have?
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: ['73/74', '1/2', '" Weight Loss "‡', 'Paul Feig', 'Lee Eisenberg & Gene Stupnitsky', 'September25,2008', '5001/5002', '9.20']
SQL:

assistant: SELECT "U.S. viewers (millions)" FROM "Table" WHERE "Written by" = 'Warren Lieberstein & Halsted Sullivan';