The present invention is generally related to messaging systems and, more particularly, is related to {HEAD ~ the evaluation} of {TAIL ~ messaging systems} 
of
The present invention is generally related to messaging systems and , more particularly , is related to { HEAD ~ the evaluation } of { TAIL ~ messaging systems }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL