Each arm has {TAIL ~ an outer border} 70 and a pair of opposite sides 72, 74 that extend largely radially from the axis 24 of the polygon, and each arm forms a cutting edge at the intersection of the outer border and {HEAD ~ each side} of the arm 
Each arm has { TAIL ~ an outer border } 70 and a pair of opposite sides 72 , 74 that extend largely radially from the axis 24 of the polygon , and each arm forms a cutting edge at the intersection of the outer border and { HEAD ~ each side } of the arm
OTH OTH OTH TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH