The horizontal lands and {TAIL ~ horizontal ribs} extend continuously in a vertical direction from {HEAD ~ the shoulder region} to the base portion 
The horizontal lands and { TAIL ~ horizontal ribs } extend continuously in a vertical direction from { HEAD ~ the shoulder region } to the base portion
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH