docs: public boolean anchor(long key, long value) {
      for (Map<Long, Long> m : buckets) {
        if (m.containsKey(key)) {
          long currentValue = m.get(key);
          long newValue = currentValue ^ value;
          m.put(key, newValue);
  
          return newValue == 0;
        }
      }
      return false;
    }