I read the article twice and still doesn't make sense. I tried to make sense but no matter how I slice and dice the article, the "inverse parentheses" idea seem

I read the article twice and still doesn't make sense. I tried to make sense but no matter how I slice and dice the article, the "inverse parentheses" idea seems inconsistent or ill defined. Two comments here which explain the ill-definedness of it: https://news.ycombinator.com/item?id=46352560 https://news.ycombinator.com/item?id=46352560 https://news.ycombinator.com/item?id=46352697 https://news.ycombinator.com/item?id=46352697