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noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru, transitive verb, nouns which may take the genitive case particle 'no'
custom, common practice, habit
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シンナーなどの常習性のある物をしてると言う事は、更正する可能性が低いと思います。
I think that, as he's using addictive substances like thinner, the chance of rehabilitation is low.
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