Problem with rearanging list with paired letters next to each others

[dn]

On 12/11/2020 00:45, Bischoop wrote:
> I see now I overcomplicated it, what is a good idea then?


This is a variation on a data-compression technique called 
RLE=Run-Length Encoding (excepting that in this case there is no need to 
count the repetitions).

Web.Ref:
https://stackabuse.com/run-length-encoding/
-- 
Regards =dn