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