入門 [ㄖㄨˋ ㄇㄣˊ; ru4 men2]
  entrance door
  to enter a door
  introduction (to a subject)
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  入門
  にゅうもん
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  nouns which may take the genitive case particle `no'
  primer
  manual
  entering an institute
  introduction to
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