We are indebted to Profs. Victor Fernandez-Viagas and Weibo Liu for generously sharing their code and for guiding us on the reimplementation of their tiebreakers. We are very grateful to the referees, for their valuable comments on earlier versions of this paper. This research has been partially supported by the Fondo Nacional de Desarrollo Cient?fico, Tecnol?gico y de Innovaci?n Tecnol?gica (FONDECYT) and the World Bank through projects Kusisqa (014/2019 - FONDECYT - BM - INC.INV) and Het-FSSP (445/2019 - FONDECYT - PIB); and by the supercomputing center ?Inkari? of the Universidad Nacional de San Agust?n de Arequipa.