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