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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2021
Cash and cash equivalents [abstract]  
Cash and cash equivalents
December 31, 2021December 31, 2020
Short-term bank deposits569,816 415,387 
Short-term investment1,224,546 1,224,678 
1,794,362 1,640,065