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tokens: ACKNOWLEDGEMENTS We thank the referee for his/her constructive reports and very helpful suggestions regarding the presentation of this paper and the interpretation of our results, S. J. Aarseth for providing the code used in this research, O. Vaduvescu, F. Roig, M. N. De Prá, and S. Deen for comments, and A. I. Gómez de Castro for providing access to computing facilities. This work was partially supported by the Spanish ‘Ministerio de Economía y Competitividad’ (MINECO) under grants ESP2015-68908-R and ESP2017-87813-R. In preparation of this paper, we made use of the NASA Astrophysics Data System and the Minor Planets Center (MPC) data server.