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Advance for investment (Details)
12 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
CNY (¥)
Advance for investment $ 1,902,004 $ 1,732,775  
Total $ 1,902,004 $ 1,732,775 ¥ 13,070,000