TCP Selective acknowledgement may also be supported by {HEAD ~ the software} to minimize {TAIL ~ retransmission data requirements} 
to minimize
TCP Selective acknowledgement may also be supported by { HEAD ~ the software } to minimize { TAIL ~ retransmission data requirements }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL