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