|Code Listing by Peter Norvig|
A dictionary with a default value (such as 0 or , or whatever you want) for unassigned keys
Given a message encoded with a shift/rotation cipher, such as rot13, this recipe recovers the most probable plain text for the message. It does this by using statistics of bigram (2-character sequence) counts from a sample of text.
Implement the argmin function from math, in a form that makes use of generator expressions in 2.4.
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