public static void main(String[] args) { IntNode d = new IntNode(5); d.setLeftNode(new IntNode(2)); d.setRightNode(new IntNode(4)); IntNode e = new IntNode(7); e.setLeftNode(new IntNode(-2)); IntNode f = new IntNode(9); IntNode g = new IntNode(10); IntNode b = new IntNode(-6); b.setLeftNode(d); b.setRightNode(e); IntNode c = new IntNode(-3); c.setLeftNode(f); c.setRightNode(g); IntNode a = new IntNode(1); a.setLeftNode(b); a.setRightNode(c); printSums(a, 2); }