d-preformative

IEG:
  t-preformative                                           Pre-IndoEuropean-AfroAsiatic
    originally forming reflexives
  >
  d-preformative                                           Proto-IndoEuropean

  eg. 
  dákru                       “tear”                       Greek
  dípsa                       “thirst”                     Greek
  dlUgU                       “long”                       Old Church Slavonic
  :
  *ak^-                       “sharp, sour”                Proto-IndoEuropean
  yabisa                      “became arid”                Arabic
  longus                      “long”                       Latin


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