ImmutableList<T> unrelatedGroup = groups.get(unrelatedGroupNumber);
            for (int unrelatedItemNumber = 0;
                unrelatedItemNumber < unrelatedGroup.size();
                unrelatedItemNumber++) {
              assertUnrelated(groupNumber, itemNumber, unrelatedGroupNumber, unrelatedItemNumber);
            }
          }
        }
      }
    }
  }