Which apartments have bookings with both status codes "Provisional" and "Confirmed"? Give me the apartment numbers.
select t2.apt_number from apartment_bookings as t1 join apartments as t2 on t1.apt_id = t2.apt_id where t1.booking_status_code = "Confirmed" intersect select t2.apt_number from apartment_bookings as t1 join apartments as t2 on t1.apt_id = t2.apt_id where t1.booking_status_code = "Provisional"