I am trying to replicate the coptic language numbering system with uses letters instead of number (with an abbreviation mark). How can I can set up that in an opentype feature?
Info about the numbering system:
1-10 (there are ten letters
11-19 consists of the letter for 10 and than the letters for 1-9 then 21-29 consists of another letter (different from the previous) for 20 and then the letters for 1-9
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