But the biggest headache, until late in the development period, remained the functionality of the software keyboard. The problem was finger size. If you tried to type, say, the letter “e,” your finger might trigger a range of other letters instead. The solution, as ever, came from clever design. Apple engineers used artificial intelligence techniques to create an algorithm that would predict which letter a user might want to type next. For example, if someone types the letter “t,” there is a very high probability that they will want to type “h” next. So, the letter “h” would, to the naked eye,
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