“I see. You’ve been starting at AAAAAAA... and working up to ZZZZZZZZ....” “Exactly — though we use a special alphabet of our own. Modifying the electromatic typewriters to deal with this is, of course, trivial. A rather more interesting problem is that of devising suitable circuits to eliminate ridiculous combinations. For example, no letter must occur more than three times in succession.” “Three? Surely you mean two.” “Three is correct: I am afraid it would take too long to explain why, even if you understood our language.”