Blades 53 55 are parallel to one another and are oriented at an angle identical to {HEAD ~ the angle} of {TAIL ~ slots} 50 52 
Blades 53 55 are parallel to one another and are oriented at an angle identical to { HEAD ~ the angle } of { TAIL ~ slots } 50 52
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH