user: Question: Which kind of Edition that has a Surface of Clay, and Park Sung-hee as an opponent?
Columns: ['Edition', 'Round', 'Date', 'Surface', 'Opponent', 'Result']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1995 World Group I Play-Offs', 'PO', 'July 22, 1995', 'Hard', 'Amanda Coetzer', '0–6, 1–6']
SQL:

assistant: SELECT "Edition" FROM "Table" WHERE "Surface" = 'Clay' AND "Opponent" = 'Park Sung-hee';