{HEAD ~ The enclosure wall} is formed by {TAIL ~ side wall portions} ar right and left outsides of the cutter housing and front and rear enclosure wall portions hang down from the under surface 
is formed by
{ HEAD ~ The enclosure wall } is formed by { TAIL ~ side wall portions } ar right and left outsides of the cutter housing and front and rear enclosure wall portions hang down from the under surface
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH