return new Iterator<Entry<K, V>>() {
      @Nullable ValueEntry<K, V> nextEntry = multimapIterationChain.firstEntry;
      @Nullable ValueEntry<K, V> toRemove;

      @Override
      public boolean hasNext() {
        return nextEntry != null;
      }

      @Override
      public Entry<K, V> next() {
        ValueEntry<K, V> entry = nextEntry;
        if (entry == null) {
          throw new NoSuchElementException();

      lastEntry = nextEntry;
      nextEntry = null;
      return new WriteThroughEntry(lastEntry.getKey(), lastEntry.getValue().getValue());
    }

    @Override
    public boolean hasNext() {
      if (nextEntry == null) {
        while (iterator.hasNext()) {
          Entry<K, Timestamped<V>> next = iterator.next();
          if (!isExpired(next.getValue())) {
            nextEntry = next;
            return true;