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https://coinstelegram.com/2018/12/06/binance-announces-the-release-of-sub-account-feature-adds-several-trueusd-tusd-trading-pairs-into-the-usd%e2%93%88-trading-market/
Binance announces the release of sub-account feature, adds several TrueUSD (TUSD) trading pairs into the USDⓈ trading market