receiving a request to write {TAIL ~ the predetermined data} to a page to which {HEAD ~ data} has been written 
receiving a request to write { TAIL ~ the predetermined data } to a page to which { HEAD ~ data } has been written
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH