user: Question: Which Nationality has a 2.24 of xo, and a 2.20 of xo?
Columns: ['Athlete', 'Nationality', '2.15', '2.20', '2.24', '2.27', 'Result']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Artur Partyka', 'Poland', 'o', '–', 'o', '–', 2.34]
SQL:

assistant: SELECT "Nationality" FROM "Table" WHERE "2.24" = 'xo' AND "2.20" = 'xo';