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There are a few steps to try and resolve this ImportError:

1. Make sure you have the latest version of charset_normalizer installed. You can do this by running the command pip install --upgrade charset-normalizer.

2. Check if the COMMON_SAFE_ASCII_CHARACTERS constant is defined in the constant.py file under the charset_normalizer package. If it's not there, it might have been removed or renamed in a recent update.

3. Try importing the constant directly from the constant module using the syntax from charset_normalizer.constant import COMMON_SAFE_ASCII_CHARACTERS. This should bypass any namespace conflicts or circular dependencies that might be causing the ImportError.

4. If none of the above steps work, you might need to delve deeper into the package's source code to understand why the ImportError is occurring. In such a case, it's best to consult the package's documentation or reach out to the maintainers for help.