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tokens: ACKNOWLEDGEMENTS This work is based on observations obtained with the Southern African Large Telescope (SALT), programmes 2010-1-RSA-OTH-001 and 2018-1-MLT-008, and supported by the Russian Foundation for Basic Research grant 19-02-00779. AYK acknowledges support from the National Research Foundation (NRF) of South Africa. LMO acknowledges partial support by the Russian Government Program of Competitive Growth of Kazan Federal University. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.