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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def parse_setup(options: Union[List, str]) -> str: """Convert potentially a list of commands into a single string. This creates a single string with newlines between each element of the list so that they will all run after each other in a bash script. """

    if isinstance(options, str):
        return options
    return "\n".join(options)