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