Each arm has 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 {HEAD ~ the intersection} of the outer border and {TAIL ~ each side} of the arm 
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Each arm has 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 { HEAD ~ the intersection } of the outer border and { TAIL ~ each side } of the arm
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 REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH