By so pairing a relatively softer sacrifice material with a hard cutting edge, repetitions of zero clearance cutting advantageously may be achieved on a commercial scale, i.e., may include cutting repetitions on the order of thousands, tens of thousands, hundreds of thousands, even millions, without significant dulling of {HEAD ~ the cutting edge} due to {TAIL ~ the sacrifice material} 
due to
By so pairing a relatively softer sacrifice material with a hard cutting edge , repetitions of zero clearance cutting advantageously may be achieved on a commercial scale , i.e. , may include cutting repetitions on the order of thousands , tens of thousands , hundreds of thousands , even millions , without significant dulling of { HEAD ~ the cutting edge } due to { TAIL ~ the sacrifice material }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL