A voice recognition software crashes from using the letter "b", but you need to test it. You have to speak continuously for about an hour, using meaningful words, but you cannot repeat words, and you can't use the letter "b".
How can you solve this problem if no one gives you such a text and you have no time to pre-write it and you have to start speaking right away?
The answer is only one word, which shows that you can be sure to speak without the letter "b" for a long time without thinking and repeating.