In {TAIL ~ the technical parameter group}, {HEAD ~ the prime parameter} is price and the parameter set is a set of performance parameters  
In
In { TAIL ~ the technical parameter group } , { HEAD ~ the prime parameter } is price and the parameter set is a set of performance parameters
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH