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\bibitem{Ramirez-Uribe_etal2021} Ramirez-Uribe, S., Hernandez-Pinto, R. J., Rodrigo, G., Sborlini, G. F. R., \& Torres Bobadilla, W. J. (2021). Universal opening of four-loop scattering amplitudes to trees. \textit{J. High Energy Phys.}, \textit{04}(4), 129--22pp.

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