Thus, unnecessary delays are minimized in systems where {HEAD ~ the block size} of {TAIL ~ the data} is variable 
of
Thus , unnecessary delays are minimized in systems where { HEAD ~ the block size } of { TAIL ~ the data } is variable
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH