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This research is carried out in the context of the project “PeGASUS: Approximate geometric algorithms and clustering with applications in finance”(MIS 5047662) under call “Support for researchers with emphasis on young researchers: cycle B”(EDBM103). The project is co-financed by Greece and the European Union (European Social Fund-ESF) by the Operational Programme Human Resources Development, Education and Lifelong Learning 2014–2020. The original article has been corrected.