def current_chartrule(self):
        return self._current_chartrule
Generates the previous binary ordered subset.
dataset/ETHPy150Open nltk/nltk/nltk/parse/chart.py/SteppingChartParser.current_chartrule--crossover with--dataset/ETHPy150Open sympy/sympy/sympy/combinatorics/subsets.py/Subset.prev_binary