{HEAD ~ The ratchet wheel} has {TAIL ~ an annular groove} around the periphery, and a plurality of teeth equiangularly spaced around the annular groove 
{ HEAD ~ The ratchet wheel } has { TAIL ~ an annular groove } around the periphery , and a plurality of teeth equiangularly spaced around the annular groove
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH