{HEAD ~ A printer} includes a paper feeder, toner, {TAIL ~ a photo conductor}, and various mechanisms 
{ HEAD ~ A printer } includes a paper feeder , toner , { TAIL ~ a photo conductor } , and various mechanisms
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH