I wouldn't normally bother pointing out a small typo, but it seems important here, given the context. "cobalt" is spelt "Colablt" just before the first JSON rep

I wouldn't normally bother pointing out a small typo, but it seems important here, given the context. "cobalt" is spelt "Colablt" just before the first JSON representation of a trie. Enjoyed the article! Oh actually maybe there is another error. Is the "d" 'subtrie' nested one level too deep? I think it might be.