new ImmutableMap.Builder<>(mapEntries.size());
    int size = 0;

    for (Entry<? extends K, ? extends Collection<? extends V>> entry : mapEntries) {
      K key = entry.getKey();
      Collection<? extends V> values = entry.getValue();
      ImmutableList<V> list =
          (valueComparator == null)
              ? ImmutableList.copyOf(values)

 * it delegates to other components that potentially encounter problems. Then, the problem reporter can focus on
 * providing a simple error message, leaving the donkey work of creating a nice model problem to this component.
 *
 * @deprecated use {@link org.apache.maven.api.services.ModelBuilder} instead
 */
@Deprecated(since = "4.0.0")
public interface ModelProblemCollector {

		currKVS := ck.Clone()
		defKVS := DefaultKVS[subSys]
		for _, delKey := range strings.Fields(inputs[1]) {
			_, ok := currKVS.Lookup(delKey)
			if !ok {
				return Error[ErrConfigNotFound]("key %s doesn't exist", delKey)
			}
			defVal, isDef := defKVS.Lookup(delKey)
			if isDef {
				currKVS.Set(delKey, defVal)
			} else {
				currKVS.Delete(delKey)
			}
		}
		c[subSys][tgt] = currKVS
	} else {

    ImmutableMultiset.Builder<T> builder = ImmutableMultiset.builder();
    for (Entry<T, Integer> entry : counts.entrySet()) {
      builder.addCopies(entry.getKey(), entry.getValue());
    }
    return builder.build();
  }

  private ListenerCallQueue.Event<Object> countDownEvent(final CountDownLatch latch) {
    return new ListenerCallQueue.Event<Object>() {

    ImmutableMultiset.Builder<T> builder = ImmutableMultiset.builder();
    for (Entry<T, Integer> entry : counts.entrySet()) {
      builder.addCopies(entry.getKey(), entry.getValue());
    }
    return builder.build();
  }

  private ListenerCallQueue.Event<Object> countDownEvent(final CountDownLatch latch) {
    return new ListenerCallQueue.Event<Object>() {

          final Entry<K, V> backingEntry = backingIterator.next();
          return new AbstractMapEntry<K, ImmutableSet<V>>() {
            @Override
            public K getKey() {
              return backingEntry.getKey();
            }

            @Override
            public ImmutableSet<V> getValue() {
              return ImmutableSet.of(backingEntry.getValue());
            }
          };

        StringBuilder newkey = new StringBuilder();

        for (int i = 0; i < key.length(); i++) {
            char c = key.charAt(i);

            if (contains(SEPARATORS, c) || contains(WHITE_SPACE, c)) {
                // escape the separator
                newkey.append('\\');
                newkey.append(c);
            } else {
                newkey.append(c);
            }
        }

      ImmutableSetMultimap.Builder<String, String> builder = ImmutableSetMultimap.builder();
      for (Entry<String, String> entry : entries) {
        builder.put(entry.getKey(), entry.getValue());
      }
      return builder.build();
    }
  }

  private static final class ImmutableSetMultimapCopyOfEntriesGenerator
      extends TestStringSetMultimapGenerator {
    @Override

    /**
     * インデックスで指定された位置のキーを返します。
     *
     * @param index
     *            インデックス
     * @return インデックスで指定された位置のキー
     */
    public K getKeyAt(final int index) {
        return getEntryAt(index).getKey();
    }

    /**
     * インデックスで指定された位置の{@link java.util.Map.Entry}を返します。
     *
     * @param index
     *            インデックス
     * @return インデックスで指定された位置の{@link java.util.Map.Entry}
     */

            new TestStringMapGenerator() {
              @Override
              protected Map<String, String> create(Entry<String, String>[] entries) {
                return singletonMap(entries[0].getKey(), entries[0].getValue());
              }
            })
        .named("singletonMap")
        .withFeatures(
            MapFeature.ALLOWS_NULL_KEYS,
            MapFeature.ALLOWS_NULL_VALUES,