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No, CHR$ 144 is the first udg character. Next udg character is CHR$ 145 ("b") and so on until the last udg "u" which is CHR$ 164. You have 21 udg characters which you can change as you want (a,b,c,d,e, f, g, ... u).  In the code you posted earlier you changed udg character "n" which is CHR$ 157.

Good spot - I assumed everyone started from USR "a" lol! :)