{TAIL ~ A system} 2, wherein the one or more directives comprise {HEAD ~ an inbound and an outbound directive} 
{ TAIL ~ A system } 2 , wherein the one or more directives comprise { HEAD ~ an inbound and an outbound directive }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD