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