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