{HEAD ~ A rotor} 1 wherein {TAIL ~ the plurality} of rings comprise at least three rings 
wherein
{ HEAD ~ A rotor } 1 wherein { TAIL ~ the plurality } of rings comprise at least three rings
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH