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Squat toilets?
It might be quite a taboo in the U.S. or other developed countries, and even here in Brazil they're quite controversial due to their most frequent usage in prisons due to safety concerns. They're also not so user-friendly for disableds and the elderly, even though there are some relatively cheap ways to overcome this issue. On the other hand, the lower water consumption and the easier cleaning might turn a squat toilet into a more sustainable option.
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