{HEAD ~ The connections} between connection management device 20 and server 14 are typically {TAIL ~ persistent connections} 
are typically
{ HEAD ~ The connections } between connection management device 20 and server 14 are typically { TAIL ~ persistent connections }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL