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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 _pairwise(iterable):
 """ Wrapper on itertools for SVD_magnitude. """

    a, b = itertools.tee(iterable)
    next(b, None)
    if sys.version_info.major == 2:
        return itertools.izip(a, b)
    else:
        return zip(a, b)