Yeam im shuffling it untill it can or cant finds a combination, because i couldnt come with better idea :D

Kinda random and not much optimized but interesting idea :)

Yea like what this even means? "...where same characters always map to the same digits and different characters always map to different digits." Sound like a Chinese riddle:
"When the ghost is on the mountain,
When the millet is transported by women,
They will become rulers of the empire."

Easy to understand

nice and simple

Looks nice and easy to understand :)

thx

Clean one.

Nice and simple :)