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| 下水 ichi1 news1 nf17 (gesui); 水洗便所排水 River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 黒水 River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
| 黒い水 (くろいみず) | |||
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| 廃水 (haisui) | |||
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