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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2021
INVENTORIES  
Schedule of inventories

At December 31, 

At December 31, 

    

2020

    

2021

$

$

Raw materials

 

90,308

 

155,433

Work-in-process

 

69,132

 

117,509

Finished goods

 

536,541

 

919,432

 

695,981

 

1,192,374