What was the surface made of in the contest where Paula Ormaechea was the partner?
CREATE TABLE table_31928 (
    "Outcome" text,
    "Date" text,
    "Tournament" text,
    "Surface" text,
    "Partner" text,
    "Opponent in the final" text,
    "Score" text
)
SELECT "Surface" FROM table_31928 WHERE "Partner" = 'paula ormaechea'
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: What was the surface made of in the contest where Paula Ormaechea was the partner? ### Input: CREATE TABLE table_31928 (
    "Outcome" text,
    "Date" text,
    "Tournament" text,
    "Surface" text,
    "Partner" text,
    "Opponent in the final" text,
    "Score" text
) ### Response: SELECT "Surface" FROM table_31928 WHERE "Partner" = 'paula ormaechea'