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Haskell, 100 bytes, unknown score
f!x|x<' '=f|q<-(!pred x),r<-(q$q f)[x]=foldl(.)q[q|_<-r,_<-r]f
main=print$(\x->x++x)!'�'$[pred ':']
The special character (2^16 - 3 ascii) counts as 2 bytes. pred ':' is equal to '9'.
I'll be severely impressed if someone can tell me what my score is.
Argua...