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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 GetLinkedFileEntry(self):
 """Retrieves the linked file entry, for example for a symbolic link. Returns: OSFileEntry: linked file entry or None if not available. """

    link = self._GetLink()
    if not link:
      return None

    path_spec = os_path_spec.OSPathSpec(location=link)
    return OSFileEntry(self._resolver_context, self._file_system, path_spec)