There's no way back in a row of water-powered see-saws.
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Lindner, J. F., Patton, K. M., Odenthal, P. M., Gallagher, J. C. & Breen, B. J. Phys. Rev. E 78, 066604 (2008).
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Ball, P. A waterway for one-way waves. Nature (2009). https://doi.org/10.1038/news.2009.3