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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 ti(self):
 """Include the Threat Intel Module. .. Note:: Threat Intell methods can be accessed using ``tcex.ti.<method>``. """

        if self._ti is None:
            from .tcex_ti import TcExTi

            self._ti = TcExTi(self)
        return self._ti