}
      }
      return null;
    }

    @Override
    public int size() {
      return entriesByLowerBound.size();
    }

    @Override
    Iterator<Entry<Range<K>, V>> entryIterator() {
      return entryIterable.iterator();
    }
  }

  @Override
  public RangeMap<K, V> subRangeMap(Range<K> subRange) {
    if (subRange.equals(Range.all())) {
      return this;
    } else {

    }

    @Override
    public Iterator<Entry<E>> iterator() {
      return entryIterator();
    }

    @Override
    public int size() {
      return distinctElements();
    }
  }

  Set<Entry<E>> createEntrySet() {
    return new EntrySet();
  }

  abstract Iterator<Entry<E>> entryIterator();

  abstract int distinctElements();

  // Object methods

  /**

      return frequency;
    }

    @Override
    Iterator<E> elementIterator() {
      return Multisets.elementIterator(entryIterator());
    }

    @Override
    Iterator<Entry<E>> entryIterator() {
      final Iterator<Map.Entry<E, Integer>> backingEntries = backingMap.entrySet().iterator();
      return new UnmodifiableIterator<Multiset.Entry<E>>() {
        @Override

    }

    @Override
    public Iterator<Entry<E>> iterator() {
      return entryIterator();
    }

    @Override
    public int size() {
      return distinctElements();
    }
  }

  Set<Entry<E>> createEntrySet() {
    return new EntrySet();
  }

  abstract Iterator<Entry<E>> entryIterator();

  abstract int distinctElements();

  // Object methods

  /**

   */
  public void removeAllZeros() {
    Iterator<Entry<K, AtomicLong>> entryIterator = map.entrySet().iterator();
    while (entryIterator.hasNext()) {
      Entry<K, AtomicLong> entry = entryIterator.next();
      AtomicLong atomic = entry.getValue();
      if (atomic != null && atomic.get() == 0L) {
        entryIterator.remove();
      }
    }
  }

  /**

    Entry<String, String> firstEntry = entries.iterator().next();
    entries.remove(firstEntry);
    assertFalse(underlying.containsKey("f"));

    Iterator<Entry<String, String>> entryIterator = entries.iterator();
    entryIterator.next();
    entryIterator.remove();
    assertFalse(underlying.containsKey("g"));

    assertTrue(underlying.isEmpty());
    assertTrue(map.isEmpty());
    assertTrue(keys.isEmpty());

    }
    if (object instanceof ImmutableEnumMap) {
      object = ((ImmutableEnumMap<?, ?>) object).delegate;
    }
    return delegate.equals(object);
  }

  @Override
  UnmodifiableIterator<Entry<K, V>> entryIterator() {
    return Maps.unmodifiableEntryIterator(delegate.entrySet().iterator());
  }

  @Override
  Spliterator<Entry<K, V>> entrySpliterator() {

        }
      }
      return null;
    }

    @Override
    public int size() {
      return entriesByLowerBound.size();
    }

    @Override
    Iterator<Entry<Range<K>, V>> entryIterator() {
      return entryIterable.iterator();
    }
  }

  @Override
  public RangeMap<K, V> subRangeMap(Range<K> subRange) {
    if (subRange.equals(Range.all())) {
      return this;
    } else {

      return backingMultiset;
    }

    @Override
    public SortedMultiset<E> descendingMultiset() {
      return new StandardDescendingMultiset() {

        @Override
        Iterator<Entry<E>> entryIterator() {
          return backingMultiset.descendingMultiset().entrySet().iterator();
        }
      };
    }

    @Override
    public NavigableSet<E> elementSet() {
      return new StandardElementSet();

          final Iterator<Entry<K, V>> entryIterator) {
    return new UnmodifiableIterator<Entry<K, V>>() {
      @Override
      public boolean hasNext() {
        return entryIterator.hasNext();
      }

      @Override
      public Entry<K, V> next() {
        return unmodifiableEntry(entryIterator.next());
      }
    };
  }