Each arm has an outer border 70 and {HEAD ~ a pair} of {TAIL ~ 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 each side of the arm 
Each arm has an outer border 70 and { HEAD ~ a pair } of { TAIL ~ 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 each side of the arm
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL 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