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20-F
EX-1.1
EX-2.1
EX-2.3
EX-2.5
EX-2.6
EX-4.13
EX-8.1
EX-12.1
EX-12.2
EX-13.1
EX-13.2
EX-15.1
EX-15.2
Employee Benefits (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Compensation Related Costs [Abstract]
Employee benefits
$ 4,714,418
$ 4,603,077
$ 3,003,978