How to append a modified list into a list?

[jfong at ms4.hinet.net]

Peter Otten at 2016/11/19 5:40:34PM wrote:
> And now for something completely different ;)
> 
> What if you only record the changes to the list? For a long list that would 
> save space at the expense of calculation time. For example:

Excellent! Although not 100% fit into my application, I must study how this Class works. Thank you.

--Jach