No  definitions  found  for  "grex",  perhaps  you  mean: 
  web1913:  Rex  Gre  Gree  Gres  Gret  Grew  Grey 
  wn:  Crex  grey 
  gazetteer:  Rex 
  jargon:  grep 
  foldoc:  REX  GRE  grix  grep 
  vera:  GRE  GREP 

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