user: Question: For edition is 2011 Europe/Africa Group IIIB and surface where score is 6–4, 6–1 please specify all the surface
Columns: ['Outcome', 'Edition', 'Opponent Team', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '2008 Europe/Africa Group IIIA', 'Mauritius', 'Clay', 'Astrid Tixier', '6–1, 6–2']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Score" = '6–4, 6–1' AND "Edition" = '2011 Europe/Africa Group IIIB';