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Weekly Challenges
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My solution.
Spoiler
Workflow
Formula Tool 1
Start = CharToInt(Substring([tag],4,1))
End = IF [Start] = 0 THEN 0 ELSE CharToInt(Right([tag], 1)) ENDIF
Formula Tool 2
New_Tag = Left([tag], 4) + CharFromInt([Start])
Formula Tool 1
Start = CharToInt(Substring([tag],4,1))
End = IF [Start] = 0 THEN 0 ELSE CharToInt(Right([tag], 1)) ENDIF
Formula Tool 2
New_Tag = Left([tag], 4) + CharFromInt([Start])
Great challenge
Spoiler
assumed that all tags of 5 characters or less was correct, and used generate rows, converting the suffix letter to unicode number
