The Alan Turing
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Mike and Ellie headed off to the lifts with the rest of their class. As the lift arrived, everybody got in.
The lift sluggishly started to move. "There are far too many people trying to use this lift at the same time!" said Ellie. "It's so annoying when things go slowly," said Mike. Ellie glared at Darcie and Donna, who were repeatedly pressing the ground floor button over and over again.
Mike whipped out his note book and started to scribble on it. "Here you go, Ellie," he said, as he ripped off the top page. "Whilst we're having this unforeseen interlude, here's a code for you to crack."