Find the number of characteristics that the product "flax" has.
SELECT count(*) FROM products AS t1 JOIN product_characteristics AS t2 ON t1.product_id  =  t2.product_id JOIN CHARACTERISTICS AS t3 ON t2.characteristic_id  =  t3.characteristic_id WHERE t1.product_name  =  "flax"
"Keten" ürününün sahip olduğu özelliklerin sayısını bulun.