代代 [ㄉㄞˋ ㄉㄞˋ; dai4 dai4]
  from generation to generation
  generation after generation
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  代々
  代代
  世々
  世世
  だいだい
  代々
  代代
  よよ
  adverbial noun (fukushitekimeishi)
  noun (temporal) (jisoumeishi)
  for generations
  hereditary
  generation after generation
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