{TAIL ~ The lower portion} is recessed relative to the upper portion in {HEAD ~ a direction} toward the opposite cutting edge 
{ TAIL ~ The lower portion } is recessed relative to the upper portion in { HEAD ~ a direction } toward the opposite cutting edge
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH