Tongue twister book by Dr. Seuss, published in 1965. This was my all time favourite book when I was a kid, and I still have the copy I got when I was little. It's divided up into several sections in which Mr. Fox tries to get Mr. Knox to say complicated tongue twisters. They start out fairly easy, but get harder as you keep reading.

"Let's have a little talk about tweetle beetles..."

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