
Another idea would be to have 13 'ghost' tiles that are never used, and the 14th tile would be a "shift" tile to move all the tiles (including the "shift" tile) 11 places or somesuch to be used whenever the letter you wanted to use had no 'real' tile assigned, but then it would require too much work on the part of anyone trying to get it back into English (a half-interesting idea for a simple cipher, though; I'll return to this at some point).
Will also at some point try another set made up from squares with three dots per side; this'll allow just about a full character set (it should be 132 tiles, I think, as the number of permutations for n dots in total should be Cn/2 (the ((n/2))th Catalan number))... though some jiggerypokery will be needed as the colours will need swapped in a kind of checkerboard pattern.
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