class Node { 

    public Node(Comparable elem, Node lft, Node rght) {
	element = elem;
	left = lft;
	right = rght;
    }

    public Node(Comparable elem) {
	element = elem;
    }

    public Comparable element() {
	return element;
    }

    public Node left() {
	return left;
    }

    public Node right() {
	return right;
    }

    public void setLeft(Node newLeft) {
	left = newLeft;
    }

    public void setRight(Node newRight) {
	right = newRight;
    }

    public void setElement(Comparable elem) {
	element = elem;
    }

    private Comparable element;
    private Node left;
    private Node right;
}