def _prove(self, goal=None, assumptions=None, verbose=False):
        if not assumptions:
            assumptions = []

        stdout, returncode = self._call_prover9(self.prover9_input(goal, assumptions),
                                                verbose=verbose)
        return (returncode == 0, stdout)
remove the left-whitespace margin of a block of Python code.
dataset/ETHPy150Open nltk/nltk/nltk/inference/prover9.py/Prover9._prove--crossover with--dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/mako/pygen.py/adjust_whitespace