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