In a conversation (conversation and attached pictures at https://bsky.app/profile/liotier.bsky.social/post/3ldxvutf76...), I delete a spurious "de" ("Produce de two-dimensional chart [..]" to "Produce two-dimensional [..]") and ChatGPT generates a new version of the graph, illustrating a different function although nothing else has changed and there was a whole conversation to suggest that ChatGPT held a firm model of the problem. Confirmed my current doctrine: use LLM to give me concepts from a huge messy corpus, then check those against sources from said corpus.