3: List of additional characters that should be treated as upper-case
4: 255 characters table - to-lower case conversion table.
-Can be usefull for example for comparing nicknames that contains similar-looking characters with different codes.
+Can be useful for example for comparing nicknames that contains similar-looking characters with different codes.
5: 255 characters table - to-upper case conversion table.
-Can be usefull for example for comparing nicknames that contains similar-looking characters with different codes.
+Can be useful for example for comparing nicknames that contains similar-looking characters with different codes.
6: List of additional UTF-8 allowed characters