unrelatedItemNumber < unrelatedGroup.size();
                unrelatedItemNumber++) {
              assertUnrelated(groupNumber, itemNumber, unrelatedGroupNumber, unrelatedItemNumber);
            }
          }
        }
      }
    }
  }

  private void assertRelated(int groupNumber, int itemNumber, int relatedItemNumber) {
    Item<T> itemInfo = getItem(groupNumber, itemNumber);