O: Cylin
    
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m: 
   1 UԦ\      YҨ   ->   L    ->  o 
   2 uC            Y_Ҩ2   ->   o 
                      
  tP  , Parker, , g|  
  

 T -- Ŀ        ==> ʱYT
      Ŀ(w) ==> ʱY

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