任意 [ㄖㄣˋ ㄧˋ; ren4 yi4]
  arbitrary
  at will
  at random
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  任意
  にんい
  nouns which may take the genitive case particle `no'
  adjectival nouns or quasi-adjectives (keiyodoshi)
  noun (common) (futsuumeishi)
  optional
  voluntary
  arbitrary
  random
  discretionary
  facultative
  spontaneous
  any
  mathematics
  arbitrary
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