user: Question: What shows for the League when the FA Cup is 6 (20)?
Columns: ['Name', 'Years', 'League a', 'FA Cup', 'League Cup', 'Other b', 'Total']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Joe Bradford Category:Articles with hCards', '1920–1935', '249 (414)', '18 (31)', '0 (0)', '0 (0)', '267 (445)']
SQL:

assistant: SELECT "League a" FROM "Table" WHERE "FA Cup" = '6 (20)';