Connection and {TAIL ~ disconnection} to and from {HEAD ~ the hosts} are carried out according to the host information 
Connection and { TAIL ~ disconnection } to and from { HEAD ~ the hosts } are carried out according to the host information
OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH