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