ChatGPT 5 still couldn't give me a list of US states that had the letter 'r' in it without including Massachusetts, Illinois and Indiana.
Not quite the Phd-level OpenAI claim it is. 🤣
You have to be good at prompt engineering when it comes to single letter problems.
List the name of all the states in the United States.
For each state, treat its name as a string of characters and determine if this string contains the letter 'r'.