How many n are listed for berbers from siwa?
CREATE TABLE table_21481509_4 (COUnT VARCHAR, population VARCHAR)
SELECT COUnT AS n FROM table_21481509_4 WHERE population = "Berbers from Siwa"
### Context: CREATE TABLE table_21481509_4 (COUnT VARCHAR, population VARCHAR) ### Question: How many n are listed for berbers from siwa? ### Answer: SELECT COUnT AS n FROM table_21481509_4 WHERE population = "Berbers from Siwa"