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