> On Thu, Jul 11, 2019 at 9:47 AM David Fetter <david@fetter.org> wrote:
>
> Looks great!
>
> The tutorial piece has bit-rotted slightly. Please find attached a
> patch atop yours that fixes it.
Indeed, I've missed this change, thank you! Although there supposed to be an
upperindex, not numupper (since the latter is just a number of upper indexes).