Within each parameter group there is a prime parameter and {TAIL ~ a parameter set} comprised of {HEAD ~ sub parameters}  
Within each parameter group there is a prime parameter and { TAIL ~ a parameter set } comprised of { HEAD ~ sub parameters }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH