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