having problem in coding a small system, which can let user to key in the input and save it into txt before checking the txt file whether the data is duplicated or not

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I see no code here so I can't comment about the code as it is. Without that and the txt file all I can offer is that you should check for duplicates before saving it to the txt file.

As @rproffitt has quoted that we cannot assist you without seeing the code.
So, please share the code so that we can help you in solving your problem
in coding a small system.

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