Discussion
What is a cryptarithmetic puzzle as a constraint problem?
Answer: C
Making each letter a variable over the digits, adding an all different constraint and writing one constraint per column with an auxiliary carry variable is the standard model. The carries are the modelling subtlety, since without them the column constraints cannot be written locally. The alternatives invert the roles or discard the structure. Introducing auxiliary variables to make constraints local is a technique that recurs throughout constraint modelling.
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