previous = None  # `previous` initially points to None
    current = p  # `current` points at the first element
    following = current.dalsi  # `following` points at the second element

    # go till the last element of the list
    while current:
        current.dalsi = previous  # reverse the link
        previous = current  # move `previous` one step ahead
        current = following  # move `current` one step ahead
        if following:  # if this was not the last element
            following = following.dalsi  # move `following` one step ahead

    p = previous
    return p