ソウ 
はこ 
() box () train car
     
はこ (n) (1) box, (2) car (of a train, etc.), (3) shamisen case, shamisen, (4) (arch) man who carries a geisha's shamisen, (5) (arch) receptacle for human waste, feces (faeces)

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Etymologies: 中文字譜 : 説文解字