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