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Google Researchers’ Attack Prompts ChatGPT to Reveal Its Training Data
(www.404media.co)
This is a most excellent place for technology news and articles.
Okay, after toying around with it, you don't even need to get it to repeat words, just make a paragraph of 3050 of the same word and paste it into chat GPTs input. Does not seem to matter what the word is. I've experimented with adding a single different additional word.