It is convenient for the user to know {TAIL ~ the remaining toner}, {HEAD ~ the photo conductor life}, etc 
It is convenient for the user to know { TAIL ~ the remaining toner } , { HEAD ~ the photo conductor life } , etc
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH