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Error 61:  Index type is not compatible with the
           declaration
 
The specified index type, or subscript, of the array
in this statement is not consistent with the original
array declaration. For example, given the declarations:
 
   VAR
       TheGrade   : Array[ 1..25 ] OF Char;
       the_letter : Char;
 
the error occurs on the following line:
 
   the_letter := TheGrade[ 'A' ];