There is a plurality of {TAIL ~ retransmit servers} in the network buffering portions of {HEAD ~ the packets} they respectively receive during the session 
There is a plurality of { TAIL ~ retransmit servers } in the network buffering portions of { HEAD ~ the packets } they respectively receive during the session
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH