{HEAD ~ The edges} of {TAIL ~ the slots} are lined with upstanding flanges which are sharpened to form cutting edges 
of
{ HEAD ~ The edges } of { TAIL ~ the slots } are lined with upstanding flanges which are sharpened to form cutting edges
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH