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