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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def fetch(cls, channel, start, end, bits=None, host=None, port=None, verbose=False, connection=None, type=Nds2ChannelType.any()):
 """Fetch data from NDS into a `StateVector`. Parameters channel : `str`, `~gwpy.detector.Channel` the name of the channel to read, or a `Channel` object. start : `~gwpy.time.LIGOTimeGPS`, `float`, `str` GPS start time of required data, any input parseable by `~gwpy.time.to_gps` is fine end : `~gwpy.time.LIGOTimeGPS`, `float`, `str` GPS end time of required data, any input parseable by `~gwpy.time.to_gps` is fine bits : `Bits`, `list`, optional definition of bits for this `StateVector` host : `str`, optional URL of NDS server to use, defaults to observatory site host port : `int`, optional port number for NDS server query, must be given with `host` verify : `bool`, optional, default: `True` check channels exist in database before asking for data connection : `nds2.connection` open NDS connection to use verbose : `bool`, optional print verbose output about NDS progress type : `int`, optional NDS2 channel type integer dtype : `type`, `numpy.dtype`, `str`, optional identifier for desired output data type """

        new = cls.DictClass.fetch(
            [channel], start, end, host=host, port=port,
            verbose=verbose, connection=connection)[channel]
        if bits:
            new.bits = bits
        return new