@Override
    public void remove() {
      checkRemove(canRemove);
      /*
       * requireNonNull is safe because canRemove is set to true only after we initialize
       * currentEntry (which we never subsequently clear).
       */
      int frequency = requireNonNull(currentEntry).getValue().get();
      if (frequency <= 0) {
        throw new ConcurrentModificationException();
      }

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