{HEAD ~ PC meter} 10 includes {TAIL ~ conventional PC} 16, display 18 and printer 20 
includes
{ HEAD ~ PC meter } 10 includes { TAIL ~ conventional PC } 16 , display 18 and printer 20
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH