Another way this can be accomplished is by transmitting {HEAD ~ the missing packets} in {TAIL ~ a unicast session} from the retransmit servers to the repair server 
Another way this can be accomplished is by transmitting { HEAD ~ the missing packets } in { TAIL ~ a unicast session } from the retransmit servers to the repair server
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH