What is the solution for combining files in Python 3 using the "with open() as" method if it is not functioning properly?

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If the "with open() as" method is not functioning properly for combining files in Python 3, there could be a few potential solutions:

1. Check that the file paths and names are correct and exist in the specified directory.

2. Ensure that the correct file mode is used (e.g. "a" for appending, "w" for writing over existing content, "x" for creating a new file).

3. Try using a different method for combining files, such as using the "os" module to open and read each file, then write the contents to a new file.

4. Make sure that each file is properly closed after it is opened and the contents are read/written to prevent errors and data loss.

5. Consider using a different programming language or library if the issue persists.