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