user: Question: Who vacated the Pennsylvania 6th district?
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Connecticut At-large', 'Uriel Holmes (F)', 'Resigned sometime in 1818', 'Sylvester Gilbert (DR)', 'Seated November 16, 1818']
SQL:

assistant: SELECT "Vacator" FROM "Table" WHERE "District" = 'Pennsylvania 6th';