Yeah, once explained, simple to remember (and only effects but 2 of the latin alphabet transliterations across the cipher table 10 & 20

Thus there is some art form understanding developing your end; choice is introdced in deciphering, which is it?

If e.g. I use 2, is it B or ... T ;)

Likewise with the only other dropped zero number; 10; is it 1 or ... (introducing finesse for the first time; 1 = 7 & 7 = 1 (not currently shown and should be) in the first layer of cipher table) ... thus with use of 1 is it 1, or 7 (as it can't be 10; no zeroes).

7 15 2 9 2

#Lulz #CipherJokes (two twos used; art form - choice).