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Nov 19th, 2018
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  1. Node predecessor(Node node) {
  2. if ((node.left == null) && (node.right==null)) {
  3. return node;
  4. }
  5. if (node.right != null) {
  6. return predecessor(node.right);
  7. }
  8. if (node.left != null) {
  9. return predecessor(node.left);
  10. }
  11. }
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