def intersection(items):
    """Returns the intersecting set contained in items

    Args:
        items: Two dimensional sequence of items

    Returns:
        Intersecting set of items

    Example:
        >>> items = [[1, 2, 3], [2, 3, 4], [3, 4, 5]]
        >>> intersection(items)
        {3}
    """

    return set.intersection(*(map(lambda x: set(x), items)))