{TAIL ~ A computer program} embodied in a tangible computer readable medium for performing {HEAD ~ the method} 20 
{ TAIL ~ A computer program } embodied in a tangible computer readable medium for performing { HEAD ~ the method } 20
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH