{TAIL ~ The blades} of the second row are shaped so as to produce a uniform blood flow along the trailing edges of {HEAD ~ the blades} 
{ TAIL ~ The blades } of the second row are shaped so as to produce a uniform blood flow along the trailing edges of { HEAD ~ the blades }
TAIL TAIL TAIL TAIL TAIL TAIL 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