def remove_sequence(self, sequence):
        try:
            self._sequences.remove(sequence)
        except ValueError:
            pass
Validates mapper specification.
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/MHMessage.remove_sequence--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/mapreduce/output_writers.py/FileRecordsOutputWriter.validate