For this purpose, {TAIL ~ the bases} of the outer trailing edges of the second row blades have {HEAD ~ a negative propulsion angle} 
For this purpose , { TAIL ~ the bases } of the outer trailing edges of the second row blades have { HEAD ~ a negative propulsion angle }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD