def find_value_or_lower2(value, node, predecessor):
    if node() == value:
        return node()

    if node() < value:
        if node.high:
            return find_value_or_lower(value, node.high, node())
    else:
            return node()

    if node() > value:
    if node.low:
            return find_value_or_lower(value, node.low, predecessor)
        else:
            return predecessor