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This puzzle is a corrected version of

Enigma 401. In the original puzzle the result of the addition sum was given incorrectly.As noted in my comment on

Enigma 1113I have used several methods in the past to solve this kind of problem.Here is a Python program that uses the

SubstitutedSum()solver from theenigma.pylibrary. It runs in 503ms.And here is Python program that uses the

minizinc.pywrapper to generate a MiniZinc model to find the solution. It runs in 233ms.Solution:The 9th (penultimate) letter of the result is wrong. (The T should be an H). The correct sum should be: 695513243 + 673596633 = 1369109876.So, the puzzle that Uncle Bungle should have submitted is:

Which can be solved directly using the

SubstitutedSumsolver from theenigma.pylibrary in 120ms: