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Recoverable Error |
Invalid string encountered in LETTERS declaration.
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 '%/'.
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.
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