Data of the compressed extra character is registered into {TAIL ~ a predetermined area} of {HEAD ~ the storage} 
Data of the compressed extra character is registered into { TAIL ~ a predetermined area } of { HEAD ~ the storage }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD