Thus, if processing of {TAIL ~ data} of {HEAD ~ the particular segment} fails, work corresponding to that segment is lost, but not work performed on other segments 
Thus , if processing of { TAIL ~ data } of { HEAD ~ the particular segment } fails , work corresponding to that segment is lost , but not work performed on other segments
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH