r(key);
  if (_root == null) return null;
  int comp = _splay(key);
  if (comp &gt; 0) return _root.key;
  _SplayTreeNode&lt;K&gt; node = _root.right;
  if (node == null) return null;
  while (node.left != null) {
    node = node.left;
  }
  return node.key;
}</code></pre>
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