Since incision 11 is deeper than the knife depth L, there is also lubricant which is carried beneath the knife face in {HEAD ~ the region} 20 contacted by {TAIL ~ the bottom} of the incisions 11 between the log and the knife 
contacted by
Since incision 11 is deeper than the knife depth L , there is also lubricant which is carried beneath the knife face in { HEAD ~ the region } 20 contacted by { TAIL ~ the bottom } of the incisions 11 between the log and the knife
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 OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH