Question: Model the following puzzle into a constraint satisfaction problem. Each character in the following diagram represents a single digit and different characters represent different value.

Model the following puzzle into a constraint satisfaction problem. Each character in the following diagram represents a single digit and different characters represent different value. For example, SEND represents a number with 4 digits. The most significant digits are not equal to zero. You may use =, != (not equal), and arithmetic expression in your modeling. Find the value of each character, using the backtracking algorithm together with constraint propagation methods.

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In your model, you should give variables and domain as well as the constraints.

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