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i am trying to create and send a transaction to https://app.uniswap.org using SDK https://uniswap.org/docs/v2/smart-contracts/router02/

uniswap has two functions (swapExactTokensForETH and swapExactTokensForETHSupportingFeeOnTransferTokens) - tokens with and without fees. how to define a coin with or without commission? Otherwise, if sent incorrectly, the transaction will fail.

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