[libreoffice-users] sort order

Hello
Id like to know if there is a character, preferably some sort of discreet punctuation mark, that 
will come *after* z in the sort order when using natural sort. My problem is that i have some codes 
beginning Aa which really speaking should come after Z. As a number of up to 3 digits follows the 
letter(s) in each case, im getting A# followed by Aa# then B# which really wont do. I have to use 
natural sort as i need eg A12 to come after A3. Ive tried a few punctuation characters and some 
special characters but i cant find one that works. Any light that can be shed on this would be very 
  welcome indeed. I really dont want to have to precede Aa with a z if that can possibly be avoided.
Thanks
Gary

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