These recesses 14 intersect each other along {HEAD ~ edges} which extend perpendicularly towards {TAIL ~ the cutting edge} 
These recesses 14 intersect each other along { HEAD ~ edges } which extend perpendicularly towards { TAIL ~ the cutting edge }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL