解説
hand washing, washing one's hands / washing by hand, as opposed to machine washing / a restroom, a toilet, a lavatory, a bathroom
地下: underground; subterranean / 地価: the price of land
explanation
one night / a certain night; one night / all night
I understood by reading the explanation of this problem.
Sono kaisetsu wa wakari-yasui.That explains it well.
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