"Guessing" implies those guesses are being compared for correctness against a reference. That only happens during training; the rest of the time, it's not guess

"Guessing" implies those guesses are being compared for correctness against a reference. That only happens during training; the rest of the time, it's not guessing, it's selecting words. But then, how else would you expect a sentence to be made? First writing out all the vowels, and then filling in the rest of the letters between them?