Which Surface has a Semifinalist of stefan edberg thomas muster?
CREATE TABLE table_name_98 (
    surface VARCHAR,
    semifinalists VARCHAR
)
SELECT surface FROM table_name_98 WHERE semifinalists = "stefan edberg thomas muster"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which Surface has a Semifinalist of stefan edberg thomas muster? ### Input: CREATE TABLE table_name_98 (
    surface VARCHAR,
    semifinalists VARCHAR
) ### Response: SELECT surface FROM table_name_98 WHERE semifinalists = "stefan edberg thomas muster"