user: Question: what is the biggest series episode number whose production code is 2T7211?
Columns: ['No.', '#', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [23.0, 1.0, '" Normal Is the Watchword "', 'John Kretchmer', 'Rob Thomas', 'September28,2005', '2T7201', '3.30']
SQL:

assistant: SELECT MAX("No.") FROM "Table" WHERE "Production code" = '2T7211';