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31 Other operating income (expenses), net (Tables)
 12 Months Ended
Dec. 31, 2020
Other Operating Income Expenses Net  
Schedule of other operating income (expenses), net
2020 2019 2018
       
Other operating income, net 70,288 75,667 93,089
Other operating expenses 37,368 (94,415) (64,498)
       
Other operating income (expenses), net 107,656 (18,748) 28,591