I'm going to try doing this one using no "proper" programming Just neovim, 'vimshell', awk, and other command line utilities or bash features
The working or working2 files contain the end state of the vim buffer I used to get the answers. I delete some irrelevant stuff as I go but I don't remove any of the actual steps so you should be able to follow along just by reading the commands and looking at the other working files if necessary
If I use a vim command as part of the process I leave a comment like #:g/^0$/d
Though in the case of that command I probably ran it on a visual selection so it would have actually looked like :'<,'>g/^0$/d
But you get the Idea, hopefully.