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