The repair server maintains {HEAD ~ an ordered list} of {TAIL ~ the retransmit servers} that are most likely to have buffered copies of packets missing from the session 
of
The repair server maintains { HEAD ~ an ordered list } of { TAIL ~ the retransmit servers } that are most likely to have buffered copies of packets missing from the session
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 OTH OTH OTH OTH OTH OTH