def get_refs(self, recursive=False):
        return self.first.get_refs(True) + self.second.get_refs(True) if recursive else []
Handle one (message, remote) duple from .txMsgs deque
dataset/ETHPy150Open nltk/nltk/nltk/sem/drt.py/DrtBinaryExpression.get_refs--crossover with--dataset/ETHPy150Open ioflo/ioflo/ioflo/aio/proto/stacking.py/Stack._serviceOneTxMsg