{TAIL ~ A plurality} of retransmit servers in the network buffer portions of {HEAD ~ the packets} they respectively receive during the multicast session 
{ TAIL ~ A plurality } of retransmit servers in the network buffer portions of { HEAD ~ the packets } they respectively receive during the multicast session
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH