def close_fd(self):
        raise NotImplementedError()
tup - (a, b, t)
dataset/ETHPy150Open D-L/SimpleBookMarks/src/tornado/iostream.py/BaseIOStream.close_fd--crossover with--dataset/ETHPy150Open Arelle/Arelle/arelle/plugin/internet/proxyNTLM/des_c.py/PERM_OP