Here, lands 4 are divided into {TAIL ~ one third and two thirds sections} from alternating ends on {HEAD ~ adjacent lands} 4 
Here , lands 4 are divided into { TAIL ~ one third and two thirds sections } from alternating ends on { HEAD ~ adjacent lands } 4
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH