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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
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nouns which may take the genitive case particle 'no', adjectival nouns or quasi-adjectives (keiyodoshi), noun (common) (futsuumeishi)
arbitrary