Among all the female current legislators, how many of them have served for more than 4 terms?
female refers to gender_bio = 'F'; served for more than 4 terms refers to COUNT(bioguide > 4)
SELECT COUNT(CID) FROM ( SELECT T1.bioguide_id AS CID FROM current AS T1 INNER JOIN `current-terms` AS T2 ON T1.bioguide_id = T2.bioguide WHERE T1.gender_bio = 'F' GROUP BY T2.bioguide HAVING COUNT(T2.bioguide) > 4 )