かい
こわ
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You set up a net on a cross to wash your clothes in the river, when a huge wave of dirt smashes into it, breaking the whole thing and sending your clothes tumbling down the river.
You angrily search to see what caused your clothes washing machine to break and you see some kayaks (かい) upriver. The people in the kayaks are jumping around, kicking dirt up, which is what broke your stuff.