The multicast session repair system includes a repair server in {TAIL ~ the network} providing {HEAD ~ the packets} it receives in the multicast session to the recipients 
The multicast session repair system includes a repair server in { TAIL ~ the network } providing { HEAD ~ the packets } it receives in the multicast session to the recipients
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH