{TAIL ~ The rich text} is represented in {HEAD ~ a memory structure} so that various formats may be flexible maintained 
{ TAIL ~ The rich text } is represented in { HEAD ~ a memory structure } so that various formats may be flexible maintained
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH