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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 include_path(self):
 """Return 'absolute' path without regarding OS path separator This is used in ``toctree`` directives, as Sphinx always expects Unix path separators """

        parts = [self.include_dir(root=self.url_root)]
        parts.append("index")
        return "/".join(parts)