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