{HEAD ~ The middle section} 48 includes {TAIL ~ a series} of notches 56 and raised portions 58 of a type well known in the art 
includes
{ HEAD ~ The middle section } 48 includes { TAIL ~ a series } of notches 56 and raised portions 58 of a type well known in the art
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH