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