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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 cachedstr(self):
 """Returns the full string of the file contents from the cache for the file that we are currently providing intellisense for."""

        if self._cachedstr is None:
            if self.module is not None:
                refstring = self.module.refstring
                self._cachedstr = refstring.splitlines()
            else:
                self._cachedstr = []

        return self._cachedstr