user: Question: Which Scrapped/Sold has a Builder of Derby, and a Name as rebuilt of Ben Madigan?
Columns: ['Number', 'Builder', 'Built', 'Rebuilt', 'Name as rebuilt', 'Scrapped/Sold']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [33.0, 'York Rd', 'Cannot handle non-empty timestamp argument! 1902', 'Cannot handle non-empty timestamp argument! 1928', 'Binevanagh', 'Cannot handle non-empty timestamp argument! 1949']
SQL:

assistant: SELECT "Scrapped/Sold" FROM "Table" WHERE "Builder" = 'Derby' AND "Name as rebuilt" = 'Ben Madigan';