> it does not have random access to individual letters this presumes it works by understanding the components of the question and reasoning based on them. But

> it does not have random access to individual letters this presumes it works by understanding the components of the question and reasoning based on them. But it doesn't access down to that level, instead just guessing the most likely next word based on statistical tricks. so it doesn't need to "know" about letters to generate a reasonable response involving letters.