{TAIL ~ The hub} may provide the availability information based on information provided by each communication site and stored in {HEAD ~ the hub} 
{ TAIL ~ The hub } may provide the availability information based on information provided by each communication site and stored in { HEAD ~ the hub }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD