No  definitions  found  for  "gref",  perhaps  you  mean: 
  web1913:  Gre  Grief  Tref  Graf  Gruf  Gree  Gres  Gret  Grew 
  Grey 
  wn:  ref  grief  tref  grey 
  gazetteer:  Graf 
  jargon:  xref  geef  grep 
  foldoc:  GRE  xref  geef  GRAF  grep 
  vera:  GRE  GREP 

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