>>> tuple(pairwise([0, 1, 2], reverse=True))
        ((2, 1), (1, 0), (0, 2))
        >>> tuple(pairwise(['a', 'b', 'c', 'd']))
        (('a', 'b'), ('b', 'c'), ('c', 'd'), ('d', 'a'))
        >>> tuple(pairwise(['a', 'b', 'c', 'd'], reverse=True))
        (('d', 'c'), ('c', 'b'), ('b', 'a'), ('a', 'd'))
    N)