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Invalid string encountered in LETTERS declaration.
Additional Information
The lower-case string has 'X' characters in it, but the
upper-case string 'Y' has 'Z' characters.
or
The format item '%n' cannot appear inside the letters rule.
Explanation
The letters declaration takes either one string of any size or two strings of the same size after processing. Processing involves changing all the %...# character codes and allowed format items to the single characters they represent. The following format items are not allowed: '%a', '%b', '%c', '%d', '%g', '%i', '%q', '%v', '%x', '%y', '%[', '%]', or '%/'.
