user: Question: Which Round has a Competition of UEFA Cup, and a Series of 5–2?
Columns: ['Season', 'Competition', 'Round', 'Opponent', 'Home', 'Away', 'Series']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1970–71', 'Inter-Cities Fairs Cup', 'R1', 'Dundee United', '0–0', '2–3', '2–3']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Competition" = 'UEFA Cup' AND "Series" = '5–2';