user: Question: Name the womens doubles when mixed doubles is Potten Ruth Scott
Columns: ['Year', 'Mens singles', 'Womens singles', 'Mens doubles', 'Womens doubles', 'Mixed doubles']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1990.0, 'George Tsavlakidis', 'Stephanie Giantsi', 'Charalambos Kazilas Stepan Partemian', 'Ruth Scott Stephanie Giantsi', 'Stepan Partemian Alexandra Georgaki']
SQL:

assistant: SELECT "Womens doubles" FROM "Table" WHERE "Mixed doubles" = 'Potten Ruth Scott';