StringBuilder sb = newStringBuilderForCollection(collection.size()).append('[');
    boolean first = true;
    for (Object o : collection) {
      if (!first) {
        sb.append(", ");
      }
      first = false;
      if (o == collection) {
        sb.append("(this Collection)");
      } else {
        sb.append(o);
      }
    }
    return sb.append(']').toString();
  }

      return contains(element) && unfiltered.remove(element);
    }

    @Override
    public boolean removeAll(Collection<?> collection) {
      return removeIf(collection::contains);
    }

    @Override
    public boolean retainAll(Collection<?> collection) {
      return removeIf(element -> !collection.contains(element));
    }

    @Override

    return Collections.unmodifiableCollection(collection);
  }

  @Override
  public void clear() {
    // Clear each collection, to make previously returned collections empty.
    for (Collection<V> collection : map.values()) {
      collection.clear();
    }
    map.clear();
    totalSize = 0;
  }

  // Views

  /**
   * {@inheritDoc}
   *

  }

  @Override
  public boolean containsAll(Collection<?> collection) {
    return delegate().containsAll(collection);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean addAll(Collection<? extends E> collection) {
    return delegate().addAll(collection);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean retainAll(Collection<?> collection) {
    return delegate().retainAll(collection);
  }

  }

  @Override
  public boolean containsAll(Collection<?> collection) {
    return delegate().containsAll(collection);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean addAll(Collection<? extends E> collection) {
    return delegate().addAll(collection);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean retainAll(Collection<?> collection) {
    return delegate().retainAll(collection);
  }

    new ForwardingWrapperTester()
        .testForwarding(
            Collection.class,
            new Function<Collection, Collection>() {
              @Override
              public Collection apply(Collection delegate) {
                return wrap(delegate);
              }
            });
  }

  private static <T> Collection<T> wrap(Collection<T> delegate) {
    return new ForwardingCollection<T>() {
      @Override

    while (entryIterator.hasNext()) {
      Entry<K, Collection<V>> entry = entryIterator.next();
      K key = entry.getKey();
      Collection<V> collection = filterCollection(entry.getValue(), new ValuePredicate(key));
      if (!collection.isEmpty()
          && predicate.apply(Maps.<K, Collection<V>>immutableEntry(key, collection))) {
        if (collection.size() == entry.getValue().size()) {
          entryIterator.remove();
        } else {

                session,
                getIgnorableArtifacts(ignorableArtifacts));
    }

    private Set<Artifact> resolveImpl(
            Collection<? extends MavenProject> projects,
            Collection<String> scopesToCollect,
            Collection<String> scopesToResolve,
            MavenSession session,
            Set<String> projectIds)
            throws ArtifactResolutionException, ArtifactNotFoundException {

      return standardRemove(object);
    }

    @Override
    public boolean removeAll(Collection<?> collection) {
      return standardRemoveAll(collection);
    }

    @Override
    public boolean retainAll(Collection<?> collection) {
      return standardRetainAll(collection);
    }

    @Override
    public Object[] toArray() {
      return standardToArray();
    }

      return standardRemove(object);
    }

    @Override
    public boolean removeAll(Collection<?> collection) {
      return standardRemoveAll(collection);
    }

    @Override
    public boolean retainAll(Collection<?> collection) {
      return standardRetainAll(collection);
    }

    @Override
    public Object[] toArray() {
      return standardToArray();
    }

    @Override