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"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_21481509_4 (COUnT VARCHAR, population VARCHAR) Question: How many n are listed for berbers from siwa? [/INST] SELECT COUnT AS n FROM table_21481509_4 WHERE population = "Berbers from Siwa" </s>