Apparatus for communicating with data systems and {HEAD ~ a method} of communicating with {TAIL ~ data systems} 
of communicating with
Apparatus for communicating with data systems and { HEAD ~ a method } of communicating with { TAIL ~ data systems }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL