Task: Text to Code
Input (English): What city is the headquarter of the store Blackville?
Output (English): SELECT t3.headquartered_city FROM store AS t1 JOIN store_district AS t2 ON t1.store_id  =  t2.store_id JOIN district AS t3 ON t2.district_id  =  t3.district_id WHERE t1.store_name  =  "Blackville"