{HEAD ~ A user} of {TAIL ~ the printer} may need to know the status of the mechanisms mentioned above and settings, that is, the status of the printer 
{ HEAD ~ A user } of { TAIL ~ the printer } may need to know the status of the mechanisms mentioned above and settings , that is , the status of the printer
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH