### Countdown
* Conundrum
* Letters
* Picking letters to maximise score
* Numbers
* Read the "Functional Pearl"
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### Hangman
* Letter probabilities based on each word occurring once in the dictionary
* Set of candidate words filtered by length, letters guessed
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### Full Enigma and Bombe
* Steckerboard
* Three wheels
* (and all the turnover logic)
* Wheel rings
* Extend the Bombe
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### Text generation
* Read some text, find the n-grams, generate more text from that.
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### Spelling correction
* Suggest the most likely correct word, given the probability of these errors.
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