既約
  きやく
  adjectival nouns or quasi-adjectives (keiyodoshi)
  noun (common) (futsuumeishi)
  nouns which may take the genitive case particle `no'
  irreducible
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  棄約
  きやく
  noun (common) (futsuumeishi)
  breaking a promise
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  規約
  きやく
  noun (common) (futsuumeishi)
  agreement
  rules
  code
  protocol
  convention
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