user: Question: What is the largest number of wickets when there are more than 630 maidens and a best of 7/72?
Columns: ['Name', 'Career', 'Matches', 'Overs', 'Maidens', 'Runs', 'Wickets', 'Average', 'Best']
Types: ['text', 'text', 'real', 'real', 'real', 'real', 'real', 'real', 'text']
Sample row: ['Shane Warne Category:Articles with hCards', '1992-2007', 145.0, 6784.1, 1762.0, 17995.0, 708.0, 25.42, '8/71']
SQL:

assistant: SELECT MAX("Wickets") FROM "Table" WHERE "Maidens" > 630.0 AND "Best" = '7/72';