In the operational parameter group, the prime parameter is the operation cost and {HEAD ~ the parameter set} is a set of {TAIL ~ operational efficiency parameters}  
In the operational parameter group , the prime parameter is the operation cost and { HEAD ~ the parameter set } is a set of { TAIL ~ operational efficiency parameters }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH