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This function is an internal function that is used to transfer tokens from one address to another. It requires that the token address has a code length greater than 0, and then calls the IERC20 transfer selector with the address of the recipient and the value of the tokens to be transferred. It then requires that the call was successful and that the data returned is either empty or a boolean value. (autogenerated documentation)
This function allows the msg.sender (the pair) to transfer a specified amount of tokens from token0 and token1 to a specified recipient address. It requires that the msg.sender is the pair, and then it uses the _safeTransfer function to transfer the tokens from token0 and token1 to the recipient address. (autogenerated documentation)