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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2020
INVENTORIES  
Schedule of inventories

At December 31,

At December 31,

    

2019

    

2020

$

$

Raw materials

 

75,722

 

90,308

Work-in-process

 

74,105

 

69,132

Finished goods

 

404,243

 

536,541

 

554,070

 

695,981