private static BigInteger oldSlowFactorial(int n1, int n2) {
    assert n1 <= n2;
    if (IntMath.log2(n2, CEILING) * (n2 - n1) < Long.SIZE - 1) {
      // the result will definitely fit into a long
      long result = 1;
      for (int i = n1 + 1; i <= n2; i++) {
        result *= i;
      }
      return BigInteger.valueOf(result);
    }

    /*

            false, "keyword", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnCreatedTime = cci("createdTime", "createdTime", null, null, Long.class, "createdTime", null, false,
            false, false, "Long", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnQueries = cci("queries", "queries", null, null, String[].class, "queries", null, false, false, false,

            false, "keyword", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnCreatedTime = cci("createdTime", "createdTime", null, null, Long.class, "createdTime", null, false,
            false, false, "Long", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnName = cci("name", "name", null, null, String.class, "name", null, false, false, false, "keyword", 0,

            false, "keyword", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnCreatedTime = cci("createdTime", "createdTime", null, null, Long.class, "createdTime", null, false,
            false, false, "Long", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnName = cci("name", "name", null, null, String.class, "name", null, false, false, false, "keyword", 0,

            false, "keyword", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnCreatedTime = cci("createdTime", "createdTime", null, null, Long.class, "createdTime", null, false,
            false, false, "Long", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnSortOrder = cci("sortOrder", "sortOrder", null, null, Integer.class, "sortOrder", null, false, false,

            false, "keyword", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnCreatedTime = cci("createdTime", "createdTime", null, null, Long.class, "createdTime", null, false,
            false, false, "Long", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnDuplicateHostName = cci("duplicateHostName", "duplicateHostName", null, null, String.class,

      }
    }

    private static final long serialVersionUID = 0;
  }

  static final class SynchronizedRandomAccessList<E extends @Nullable Object>
      extends SynchronizedList<E> implements RandomAccess {
    SynchronizedRandomAccessList(List<E> list, @CheckForNull Object mutex) {
      super(list, mutex);
    }

    private static final long serialVersionUID = 0;
  }

      }
    }

    private static final long serialVersionUID = 0;
  }

  static final class SynchronizedRandomAccessList<E extends @Nullable Object>
      extends SynchronizedList<E> implements RandomAccess {
    SynchronizedRandomAccessList(List<E> list, @CheckForNull Object mutex) {
      super(list, mutex);
    }

    private static final long serialVersionUID = 0;
  }

      long seed = insertRandomly(elements, q);
      while (!q.isEmpty()) {
        elements.add(q.pollFirst());
      }
      assertEqualsUsingSeed(seed, expected, elements);
    }
  }

  /** Regression test for bug found in random testing. */
  public void testCorrectOrdering_73ElementBug() {
    int size = 73;
    long seed = 7522346378524621981L;

  @Param({"1", "10"})
  int length;

  private String originalString;

  @BeforeExperiment
  void setUp() {
    originalString = Strings.repeat("x", length);
  }

  @Benchmark
  void oldRepeat(long reps) {
    for (int i = 0; i < reps; i++) {
      String x = oldRepeat(originalString, count);
      if (x.length() != (originalString.length() * count)) {
        throw new RuntimeException("Wrong length: " + x);
      }