{HEAD ~ These parts} are identified with {TAIL ~ reference} to the position of the tool shown in FIGS 1 and 3 
are identified with
{ HEAD ~ These parts } are identified with { TAIL ~ reference } to the position of the tool shown in FIGS 1 and 3
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH