The presence of the intermediate layer also allows {HEAD ~ the use} of {TAIL ~ a cutting tool} terminating in a cylinder that has a blunt cutting edge, in addition to tools terminating in cylinders that have sharp cutting edges 
The presence of the intermediate layer also allows { HEAD ~ the use } of { TAIL ~ a cutting tool } terminating in a cylinder that has a blunt cutting edge , in addition to tools terminating in cylinders that have sharp cutting edges
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH