Question: Solve the following cryptarithmetic problem. Each letter stands for a distinct digit (0-9) and the goal is to find a substitution of digits for letters

Solve the following cryptarithmetic problem. Each letter stands for a distinct digit (0-9) and the goal is to find a substitution of digits for letters such that the resulting sum is arithmetically correct, with no leading zero allowed. ( Disregard the underline )

_T W O

+T W O

-------------

F O U R

2) Solve the CSP problem by hand, using backtracking search with the MRV heuristic and AC-3. Show the search tree and the result of AC-3 on each partial assignment.

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