private boolean recContains(T element, BSTNode<T> tree) {
	if (tree == null)
	    return false;       // element is not found
	if (element.compareTo(tree.getInfo()) == 0)
	    return true;        // element is found
	if (element.compareTo(tree.getInfo()) < 0)
	    return recContains(element, tree.getLeft()); // Search left subtree
	return recContains(element, tree.getRight());    // Search right subtree
    }