class Node { private String value; private Node left; private Node right; public Node(String value, Node left, Node right) { this.value = value; ... } Node copy() { Node left = null; Node right = null; if (this.left != null) { left = this.left.copy(); } if (this.right != null) { right = this.right.copy(); } return new Node(value, left, right); }}
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