* #iterator} to forward to this implementation.
   *
   * @since 7.0
   */
  protected Iterator<E> standardIterator() {
    return Multisets.iteratorImpl(this);
  }

  /**
   * A sensible, albeit inefficient, definition of {@link #size} in terms of {@link #entrySet}. If
   * you override {@link #entrySet}, you may wish to override {@link #size} to forward to this

   * #iterator} to forward to this implementation.
   *
   * @since 7.0
   */
  protected Iterator<E> standardIterator() {
    return Multisets.iteratorImpl(this);
  }

  /**
   * A sensible, albeit inefficient, definition of {@link #size} in terms of {@link #entrySet}. If
   * you override {@link #entrySet}, you may wish to override {@link #size} to forward to this

        @Override
        public void remove() {
          backingIterator.remove();
        }
      };
    }

    @Override
    public Iterator<E> iterator() {
      return Multisets.iteratorImpl(this);
    }

    @Override
    public void clear() {
      countMap.clear();
    }

    private class EntrySet extends AbstractMultiset<E>.EntrySet {
      @Override

        ConcurrentHashMultiset.this.setCount(last.getElement(), 0);
        last = null;
      }
    };
  }

  @Override
  public Iterator<E> iterator() {
    return Multisets.iteratorImpl(this);
  }

  @Override
  public void clear() {
    countMap.clear();
  }

  @WeakOuter
  private class EntrySet extends AbstractMultiset<E>.EntrySet {
    @Override

        @Override
        public void remove() {
          backingIterator.remove();
        }
      };
    }

    @Override
    public Iterator<E> iterator() {
      return Multisets.iteratorImpl(this);
    }

    @Override
    public void clear() {
      countMap.clear();
    }

    private class EntrySet extends AbstractMultiset<E>.EntrySet {
      @Override

    @Override
    public void clear() {
      multiset().clear();
    }
  }

  /** An implementation of {@link Multiset#iterator}. */
  static <E extends @Nullable Object> Iterator<E> iteratorImpl(Multiset<E> multiset) {
    return new MultisetIteratorImpl<>(multiset, multiset.entrySet().iterator());
  }

  static final class MultisetIteratorImpl<E extends @Nullable Object> implements Iterator<E> {

        ConcurrentHashMultiset.this.setCount(last.getElement(), 0);
        last = null;
      }
    };
  }

  @Override
  public Iterator<E> iterator() {
    return Multisets.iteratorImpl(this);
  }

  @Override
  public void clear() {
    countMap.clear();
  }

  @WeakOuter
  private class EntrySet extends AbstractMultiset<E>.EntrySet {
    @Override

        setCount(prevEntry.getElement(), 0);
        prevEntry = null;
      }
    };
  }

  @Override
  public Iterator<E> iterator() {
    return Multisets.iteratorImpl(this);
  }

  @Override
  public SortedMultiset<E> headMultiset(@ParametricNullness E upperBound, BoundType boundType) {
    return new TreeMultiset<>(
        rootReference,