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