@NotNull
  public static DiffIterable create(@Nullable Diff.Change change, int length1, int length2) {
    DiffChangeDiffIterable iterable = new DiffChangeDiffIterable(change, length1, length2);
    verify(iterable);
    return iterable;
  }
@NotNull
  public static DiffIterable create(@Nullable Diff.Change change, int length1, int length2)