{HEAD ~ The plug} is generally identified by {TAIL ~ the reference numeral} 10 in FIGS 1 and 2 
{ HEAD ~ The plug } is generally identified by { TAIL ~ the reference numeral } 10 in FIGS 1 and 2
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH