Thanks for your answer! I don't have any specific wording suggestions. If you're willing to add a specific section on tail recursion, I think you might leave th

Thanks for your answer! I don't have any specific wording suggestions. If you're willing to add a specific section on tail recursion, I think you might leave this example in place (with the first paragraph of the current text) and then show a tail-recursive version in the next step (with a slightly modified version of the second paragraph of the current text).