user: Question: Which Sign-in/Bicker is at of Wash50 on Washington Rd?
Columns: ['Name', 'Years of Operation', 'Location', 'Historical Photos', 'Year Clubhouse Constructed', 'Sign-in/Bicker', 'Year co-ed']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['The Ivy Club', '1879–current', 'Prospect 43 Prospect Ave', 'link', '1897', 'Bicker', '1991']
SQL:

assistant: SELECT "Sign-in/Bicker" FROM "Table" WHERE "Location" = 'Wash50 on Washington Rd';