def getComplexVariableLabelLookupDict(self):
raise NotImplementedError<EOL>
Generates a lookup dictionary of permutation variables whose values
        are too complex for labels, so that artificial labels have to be generated
        for them.

        Parameters:
        ---------------------------------------------------------
        retval:       A look-up dictionary of permutation
                      variables whose values are too complex for labels, so
                      artificial labels were generated instead (e.g., "Choice0",
                      "Choice1", etc.); the key is the name of the complex variable
                      and the value is:
                        dict(labels=<list_of_labels>, values=<list_of_values>).