What is the 2006 when the 2013 is 2r, and a Tournament was the us open?
CREATE TABLE table_75956 (
    "Tournament" text,
    "2006" text,
    "2009" text,
    "2012" text,
    "2013" text
)
SELECT "2006" FROM table_75956 WHERE "2013" = '2r' AND "Tournament" = 'us open'
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 is the 2006 when the 2013 is 2r, and a Tournament was the us open? ### Input: CREATE TABLE table_75956 (
    "Tournament" text,
    "2006" text,
    "2009" text,
    "2012" text,
    "2013" text
) ### Response: SELECT "2006" FROM table_75956 WHERE "2013" = '2r' AND "Tournament" = 'us open'