No  definitions  found  for  "ucd",  perhaps  you  mean: 
  web1913:  Cud 
  wn:  Cd  cud  LCD  ScD  Urd  Uca 
  jargon:  UBD  UCE 
  foldoc:  CD  uC++  BCD  CCD  LCD  NCD  UBD  uid  UCB  UCS  UCX 
  vera:  CD  UDC  UCSD  ACD  BCD  CCD  DCD  FCD  ICD  LCD  MCD 
  NCD  OCD  PCD  RCD  SCD  UID  UPD  USD  UCC  UCE  UCI  UCP  UCR 
  UCS 

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