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Old 15th Sep 2016, 08:44
  #119 (permalink)  
Underbolt
 
Join Date: Aug 2016
Location: Nottingham
Posts: 36
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Sorry, too interested in all the codebreaking. I've just realised that as well as I and O, Z is also omitted (hence the use of modulo 23), so A follows Y, unless Y was suffixing a number ending in 9, in which case the next letter is D.

Last edited by Underbolt; 15th Sep 2016 at 15:54.
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