code: def selfcheck(tools):
      
      msg = []
      for tool_name, check_cli in collections.OrderedDict(tools).items():
          try:
              subprocess.check_output(check_cli, shell=True, stderr=subprocess.STDOUT)
          except subprocess.CalledProcessError:
              msg.append('%r not found or not usable.' % tool_name)
      return '\n'.join(msg) if msg else 'Your system is ready.'
docs: Audit the system for issues.
  
      :param tools: Tools description. Use elevation.TOOLS to test elevation.