Entry<K, V> entry = entries[index];
            return immutableEntry(entry.getValue(), entry.getKey());
          }

          @Override
          ImmutableCollection<Entry<V, K>> delegateCollection() {
            return InverseEntrySet.this;
          }

          // redeclare to help optimizers with b/310253115
          @SuppressWarnings("RedundantOverride")
          @Override