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