A process token can optionally have multiple additional types of {TAIL ~ SIDs} based on {HEAD ~ other criteria}  
A process token can optionally have multiple additional types of { TAIL ~ SIDs } based on { HEAD ~ other criteria }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH