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