"We'll the purpose"

Thank you for your feedback. 👍

I was trying about half a hour without result, but then suddenly remembered about <solution_name>, good kata, thanks :)

Added this to the description:

Note: a digit can belong to two adjacent digit-pairs. For example, in string 1???9??1, 1???9 is a digit-pair, 9??1 is also a digit-pair.

how about in the first part (1???x9)? I cannot find an exclusive rule in the description blocks this. (Please link the previous kata mention in the description also)

But there are only two question marks between 9 and 1(9??1)

How is 1???x9??1 not a valid digit pair yet there are three question marks between 1 and 9?

Thanks for the tip, I have updated the kata accordingly.

Cool kata, it leaves a lot of room for different solutions

I have taken it down. I am looking to make a complete refactor later on though it is quite hard to have secret varibles in python.